This happened last night. Invited a friend of mine I hadn't seen for nearly a decade. As he was visiting from abroad, he brought a couple along with him for sightseeing in London and the trip to my place. One of the guests, not my friend, went upstairs to the toilet. I noticed later that some of the stuff I keep out there i..e, work pass, usb sticks, loose change, was a bit ruffled. I also noticed that one of the usb sticks was missing. I vividly remember seeing them during the day. I can only attribute this loss to the guest's visit. I did a thorough search for it, but couldn't find it. No others visited our place in the few days leading upto this.
Now, do I tell my friend or just let it go? It's not the money, but it makes me sick that someone could do something like this. Thankfully, I didn't store any personal stuff on that stick.