When my wife and I added on to our house (extension and second story), they put in a pretty thick slab. Before it was poured, we got some pictures, couple dollars and change, newspaper front page, a couple picks and we recorded a CD discussing the history of the house, when we got it, what we did to it etc. Wrapped it in plastic and put it in a tin box and placed it where the slab would be poured. Been there. 20 years now.
Anybody else done this?
Anybody else done this?