Hi @Brook2 I've been hosting for 6+ years and I think that you are being too cautious. 90% of my business is from new guests (as in signed up in the month they make the inquiry). In six years, with over 1400 review, I've had extremely isolated instances of any problem, and honestly it's usually been a domestic traveler that books because they want a place to crash. I've had a German family or a Swedish couple leave a very messy place, but actual theft is never something that I worry about personally. I don't live in my my listings, but I still have lots of things that can be stolen, including laptops in most of my places.
Of course you have a different situation - but some things that maybe could work (sorry if I'm stating the absolutely obvious):
**Conversations with potential inquiring guests where you mention important house rules and conditions of bookings. This will all be in the description, which nobody reads.
**Increase of security deposit
**External cameras. I have a Ring doorbell which I love, and I pay an extra $5 for a live view every month. The doorbell has a motion detector on it, so you can easily go back and check the footage. THat doesn't stop someone from putting an expensive filter in their bag, but it will stop someone from trying to haul out a light table.
**Accept bookings from international travellers or people flying in only. Most guests want to leave stuff out of their heavy baggage, not add anything to it.
**Locking up the most valuable/portable items.
I hope that helps!