Suppose it depends where you grow up lol. We did findclothing relatively often in the woods... never felt an urge to pick it up and take it home though... Did find some shotgun shells once, wasn't allowed to keep them for some reason...
I found an actual handgun.. i can understand not keeping that.
But ammo? As long as you didn't play with naked flames, i see no reason not to keep it

I find a a lot of nightshade in the wilds of Skyrim.. very dangerous indeed.