Here's a concept. Put them in a grocery bag that appears to be just fine where it sits. It doesn't look hidden and it doesn't attract attention.
Throw some of your groceries in there if you must.
Nobody will touch it. Why? It's in plain sight. Who hides shit in plain sight?
And no, I don't believe in sharing every intimate secret with my GF. Trust me, there are reasons. Women can be very vindictive even if they claim to love you. When they get butt-hurt over something, all the shit comes out, and they can't really control it. Keep your secrets to yourself.
Safer that way.