CONSIDER THIS.
IF SOMEONE WANTS TO STEAL IT, THEY WILL. NO MATTER WHAT YOUR DETERENT.
FANCY LOCK BOXES ONLY FEED THE DESIRE. STEAL THE WHOLE BOX OPEN IT LATER.
TELL HIM YOU ARE THE DEVIL AND YOU ARE VISITING HIS LIFE TO GET HIM BACK FOR MASTURBATING INTO HIS SISTERS UNDERWEAR.....
YOU GOTTA FIGHT FIRE WITH FIRE MAN!