I honestly don't know, I stop counting when they pass 15-20. There were around 12 new never before seen by me freshly surfaced copies that popped up this year alone and they are well past the 20+ mark now. Interesting though is that almost none of them are folded maybe 3-4 that I can think of, the rest are rolled.
For those wondering how I can tell I take each new copy's unique markings be it edge wear, a rip, crease, printing mark, alignment or anything that is unique to that specific copy and use it as an identifier like a fingerprint would be used. The only way for one to not be distinguishable from another would be if it was a dead mint copy off of the same plate and plate location on the press when printed. It is I am sure not 100% foolproof but close enough for my purposes.
As an example Tob's has fold marks and just the wear at the center top cross fold alone would be enough to say it is that specific copy unless it suffered further damage. There are other marks on that one that would identify it though.