I wouldn't recommend it, but we had a local businessman with an employee who got sticky fingered with any cash that wasn't locked up. He could never prove it though.
Said employee is still doing time for trying to pass some slightly flawed counterfeit bills. As in, just flawed enough that suspicious clerks who see cash all day would spot it easily.
There might have been be some connection between the two crimes, though no one has ever been dumb enough to confirm it.
Personally, I'd be way too tempted to ship myself some fireworks that had a few of the fuses on the big stuff replaced with quickmatch. Or maybe ExLax recast in a Godiva mold. Jerky cured in epsom salt. Condoms treated with Mentholatum. Flash drive with a nasty worm or trojan.