Even if I was a customs officer, I wouldn't argue with a man wielding two crow bars and an angle grinder!
I have a small safe fitted in Tilly in a well disguised place also a hidden compartment just to drop things in when you go for a beer. Thieves want to get in and out quickly or do an opportunity theft of something easily laying around
It’s really very easy. You could use a shoe, a lighter, the heel of your hand, an onion etc etc I just choose to use a spud! ;-)