If you search for long enough you will find threads about pannier inner bags........
You are missing the point.... he knows all about inner bags.
The OP's question is whether bods will pinch - or tamper with - his empty Vario boxes while he sleeps quietly in his upper floor (end of corridor) room, exhausted by the climb.
What you should be working on is advice on secure parking, CCTV and guard dogs but, probably easiest of all:
STAYING AT HOME, IF IT'S ALL TOO BLOODY DANGEROUS OUT THERE....