I left 12 rounds of 9mm Federal Hydra Shok at H&H a week and a half ago. Unloaded the G26 mag w/ +2 extension to have prdator work on the extension (filed a sharp edge down); forgot about the unload and left them lying there. Damned nearly as expensive as a magazine. I was pissed. So if someone reading this picked up the ammo....at least send me a "thank you" PM.
You would be suprised by the stuff left behind. From unfired ammo, to firearms. Sometimes folks call or come, sometimes they don't.