We moved the entire Ong collection to the library today, which means I can begin the serious work. Unfortunately, we weren't able to box up the material ourselves, but those who did pack it up kept it organized (things from the desk with things from the desk, etc.) and wrote descriptive labels on the boxes (papers on top of filing cabinets, books taken from small bookcase, etc.).
I poked around randomly in the filing cabinets and found, among other things, Ong's Rockhurst diploma, a huge file of correspondence related to the initial publication of Ramus, Method, and the Decay of Dialogue and the Ramus and Talon Inventory, including the preliminary readers reviews (one which said the entire project was a waste of time and accused Ong of being anti-Renaissance and anti-Protestant to boot), and a bib card for Lolita with Ong's teaching notes.