In 1987 Michael Harrell was hired as an intern from Western Washington University program in archives management to refine the processing of Series III. In summer 2004 another Western Washington University intern, Megan Carlisle, assisted by Morag Stewart and Chris Carlin, refoldered, retitled and rearranged the Legislation correspondence in Series V; Carlisle and Stewart also refoldered the Indian Affairs subseries of Series V and began an encoded finding aid. In fall 2004 and 2005 Kathleen Crosman, Leslie Steinman and Morag Stewart continued work on the other subsections of Series V, beginning with Miscellaneous Correspondence. Morag Stewart also weeded, refoldered and inventoried part of Series VI. In 2006 Series VIII was processed by Janet Polata.

The Poindexter papers have been processed in stages, but the basic arrangement of the papers as they were received from the University of Virginia has been retained. Subsequent processing of selected series by the University of Washington staff concentrated on weeding non-essential material and re-inventorying those series.

In a 1956 letter, the University of Virginia's Curator of Manuscripts states that the files were processed in 1938 and kept according to the filing systems developed by Senator Poindexter, although some rearrangement was made in the 1940's when the file "bundles" were checked to see if they conformed to Poindexter's filing systems.

The 1946 microfilming project was instigated by University of Washington Professor Charles M. Gates for the Pacific Northwest History Project. It was carried out as a joint undertaking of the University of Washington and Washington State University (then State College of Washington). Preparation began in the fall of 1946 with staff at the University of Virginia writing summary descriptions of "bundles" and preparing material for filming. Files were removed from their original folders and organized into artificial "files" to facilitate filming. These resulting files were numbered in sequence within series and divided up into folders, presumably by page count since letters were occasionally split between folders. Target file sheets were put into the papers at the beginning of each numbered file. In letters between one University of Virginia staff member and Professor Gates, the lack of organization and overlapping filing systems employed by Poindexter and his staff are mentioned, and the suggestion was made to reorganize Series III. Nevertheless, most of the papers were filmed by Remington Rand as they had been received in 1939. Series VI was filmed first and the remaining series were filmed in numerical order. Not included in the filming were routine correspondence relating to discharges after World War I; requests for publications and replies; routine correspondence relating to pensions; personal invitations, Christmas cards, greetings, etc. Groupings of bank statements, cancelled checks, routine business papers, and clippings, as well as published material such as public documents and copies of popular periodicals, were also left out where deemed appropriate.

When the Poindexter papers were transferred to the University of Washington, they were accompanied by a single volume red inventory. In 1987 Series III was further processed and a new inventory to this series prepared which superceded the description in the "red inventory." Little rearrangement was done, but portions of the series were discarded. See the brief introduction to each file in the 1987 Series III finding aid for additional informaA detailed "Table of Contents" was created and filmed to accompany the microfilmed papers. The two-volume paper copy of the contents was then sent to the University of Washington in May 1947 and the microfilm arrived soon after.tion on discards and for a selective index to names (personal, corporate, geographical and topical).

Initial processing of Series V began in the summer of 2004 in the course of a Political Papers initiative. The Legislation subseries was refoldered, retitled, and rearranged. The correspondence had been arranged in a kind of overlapping alphabetical order. The first group of files went from A to Br, the second from Bo to Ca, etc. Some of the files were retitled for clarification and the whole rearranged into a purely alphabetical order. The Indian Affairs and Land Office subseries in Series V were also refoldered, but not retitled or rearranged, with a very few exceptions. An encoded inventory for Series V was begun.

Starting in fall 2004 greater liberties were taken with the remainder of Series V, starting with the Miscellaneous Correspondence subseries, and the first part of Series VI. In accordance with current records management guidelines for congressional papers correspondence and established University of Washington practice, certain types of correspondence were discarded. Routine requests (for seeds, flags, the congressional record, etc.), Case Files, and requests for patronage jobs as well as duplicate copies of published material, were extracted and discarded. A few examples of the case files discarded were retained to demonstrate the type of issues that Poindexter's office dealt with, or because they were integrated with more political correspondence. Of the patronage requests, only those for high level jobs, such as federal judgeships and cabinet positions, were retained. Folder titles were clarified and the encoded inventory was expanded. Minimal reorganization was done, mostly involving moving substantive letters originally filed with Case Files to the correspondent's name. Retained items in the "miscellaneous" sections of several files were refiled by correspondent's name or with related topical material. One major change was moving file 196 after file 207 where it clearly belonged. Processing in 2005 ended with box 393 in Series VI.

The process of weeding materials from Series III in 1987 and Series V and VI in 2004-2005 reduced the volume of the papers. As a consequence box numbers noted in the red inventory no longer match for Series III and V and the processed portion of Series VI. In addition there are now gaps in the box number sequence between Series III and IV and between Series V and VI. During processing in 2005, two small accessions, nos. 837-1 and 3828-2, were merged with 3828-1.

Processing of Series VIII was begun in 2006 and completed in 2007. It is a consolidation of the remainder of Series VIII, after non-essential material was discarded, and stray ephemera and other material that was not included on any of the original inventories.

162 photographs were relocated to the Miles C. Poindexter Collection, PH Coll.174 in1987.

Approximately 2000 loose and mounted photographs, 2 framed portraits, 6 photo albums, 2 X-rays and 2 glass slides, circa 1865-1929, were relocated to the Photography Collections in 2006.