Mr. K doesn't seem to notice - there is a bit of a draft coming from the AC unit, which may explain the paper bits.
"As far as we can tell? Vandalism, pure and simple. Nothing seems to have been stolen, at least, not that we can tell," A sigh, "And the register was untouched, for all that it only stores enough to make change and cover fines. No Graffiti, no tags... I'd say bored kids, no offense, but school just started up, and who has the time? It's a bit of a mystery, to be sure."