That was a big fat fail

Solid idea, since I haven't noticed anything missing yet, I think whoever it is will back away if it starts taking too much time or being too obvious.
.
Okay from the pictures I've seen you're not a bad looking girl so here's what I suggest.

Start dating three cops, one for each shift don't marry them just date them you might even get a free meal occasionally or taken to a movie. I'm sure this will get you free drive by security.