Who in their right mind keeps that kind of cash lying around (not in a safe), and then invites someone who is probably a complete stranger in?
A long time ago when I did do that kind of thing, one rule I had was to always undress for a shower in the bathroom, due to having several thousand Baht in my shorts pocket. I managed to maintain this rule however squiffy (drunk) I was! That is execpt for one rare occasion when a $100 bill disappeared, more fool me.