I find it odd that the housekeeper volunteered to return the passports (and sunglasses). Why did the housekeeper say anything to the guest about having entered the room?

Maybe the housekeeper thought she could sell the passports but had second thoughts that the stolen passports were more likely to be reported to the police.

A housekeeper could claim that some amount of cash on or near the bed was assumed to be a tip, but hardly cash taken from two separate places.