Once after my car had been impounded I found a 2mg Kpin sitting on the passenger seat of the van. (The pig that pulled me over asked me about it, I said, "I have no clue what that is, I share the car with my brother and father, and my brother drinks a lot so he probably had an aspirin ready to go".) The cop obviously didn't believe me, but he left it at that, and didn't take the pill. Needless to say I was very grateful when I went to snag the ride back.
I have also found 4 Adderall 30mg IR. That was a pretty nice come-up, considering it wasn't a drug I had lost previously.
I have also found a bag of forgotten mj in a coat of mine when I was halfway though opiate PAWS, needless to say, it made my night.
I've found/stolen a fair amount of pills from medicine cabinets. [nothing real special, just a handful of 7.5/500 vicodine, a few Seconal (barbituate) and some weak-as-fuck xannies] But at the time I was in severe WD, so the hoard proved to be rather nice. Even if it didn't get me high, it certainly made me feel "almost" normal for a few hours. Which, when compared to the way I was feeling previously was almost a high.
But yeah, I've lost way more drugs than I've stolen. Lost a 60mg Morphine pill, Lost an 8mg Suboxone, Lost a .25 Alprazolam, lost 1/8ths of mj at a time. Such is life.