During the 2003 IPMC, Peter Zorn(there were 3 guys named Peter at the same event) had hidden copies of the model he created as part of his Master's back in 1977 at the University of Miami (The U!)
It was a M-4 Sherman tank.
these copies were hidden under some of the chairs in the dining hall, and during dinner, we were told to check under your seat for an original Peter Zorn model
I think there for a half a dozen or so winners
the following year, in 2004, two of them showed up as assembled models.
https://goo.gl/photos/D4nxjLtNqiBA2wEG6
Rick