In November 1967, De Arte Gladiatoria was sold to the Biblioteca Nazionale di Roma. It lies there still. In the process of doing research for the second edition of Veni Vadi Vici (which should be out this year), I found the auction catalogue on ebay, and bought it. As you may know, I'm not one to keep my finds secret, so I have scanned in the relevant pages, and uploaded them here. This catalogue has the only published collation of the manuscript (the description of how it is bound together), as well as some fascinating extra details. I didn't include scans of the plates reproduced in the catalogue, as much better images are available online from wiktenauer.com.
If you happen to want other pages from this catalogue, let me know and I'll scan them for you.
Sothebys Vadi 1967
I will be releasing the corrected translation for free online, as before, and all of the original backers of the campaign will get ebook copies of the second edition sent to them for free.