A L.E.O acquaintance of mine leaves his sheriff Photo ID on the dash.  He
also mentioned leaving a half open box of your favorite ammunition on the
seat.

Seems to work for him.

Out of sight out of mind works best for me.  There ARE places in a westie
that cannot be accessed easily unless you have knowledge of their existence.
Where are they?  You don't think I'm goin' to tell you where Phaedra hides
the spare Stella-Kibbles do you?

The best answer I have seen is a behind the seat equipment safe used in
pickup cabs.  This fellow had it bolted to the floor aft of the front seats.
He had a "weekender pop top"  Yes it was in the way.  Yes he had foiled
theives before.  Five top grade flyrods and associated reels and so on is a
pretty penny to replace.  Pigbum ugly but it worked.

cheers,

pensioner