I usually don't find large amounts, but I've had quite a few nice finds in my day.
I found 63 Lorcet 10's on the kitchen table one night after a pharm/rollin' party at my house. Needless to say, I was ecstatic(no pun intended). Maybe I bought them, maybe I traded E for them(I was dealing at the time), or maybe some poor soul that I didn't know left them there. Oh well, it was awesome.
Recently I found 1mg Ativan in the kitchen cabinet, just sitting there.
I used to CONSTANTLY find Xanax bars all over my dad's old house. He was getting a script of 90 a month and then buying a few hundred or so every couple weeks, so needless to say, we were always folded and dropping bars all over the place. Nothing beats finding a few bars just by pulling out the cushion in the chair when you're desperate and going through benzo w/d's.
There's alot more, but I don't feel like writing a book about all the pharmaceuticals I've found in my day.