Yes, tables of content, acknowledgment pages, contact/solicitation pages etc. and the like could all be requested by snail mail.
I do, of course, remind you that the zine was published, and therefore already circulating: any reader could have sent it to TPTB at any time (or, sigh, worse, not even meaning to be cruel, give it to an actor or other PTB at a con, as some people unthinkingly do.)
I know that this project is crystalizing many fears (and causing some people to imagine fearsome scenarios), but all of the dangers you fear are already possible. The entire Fanzine Archive, for instance, which is the first collection we placed with Iowa, was *already listed on the internet* for ten years by Ming Wathne, the archivist. Most zines are listed for sale by their publishers (or by second hand zine dealers) with a lot more information than the Fan Culture Preservation Project is planning to attach, and some fans are selling their unwanted zines on Ebay--for money, which attracts attention--with a lot more information than our project provides: full titles, authors, story descriptions, etc.
Our project is meant as an alternative to all that, and we reckon its actually safer for fan privacy (as well as being better for posterity.)