Renee,
I don’t think I’ve seen a discussion on this site that answers your question. I think Pat is referring to museum/archive collection sites in general. (Pat, please correct me if I’m wrong.)
Nora Lockshin, of the Smithsonian Institution Archives, wrote a pretty interesting blog post on this topic as well.
http://siarchives.si.edu/blog/their-heads-matchbooks-archives
What I really like about her post is that she has many, many photos of how she has mounted the matchbooks within archival folders to prevent further damage.
