yep I have a garbage can in my bathroom right beside my toilet. But my guess is since they used my tampons (I only had 3 in my box) they were probably too embarrassed to ask and my garbage can was empty so I guess they would have figured that I would find out who was going though my stuff!
The specific parent who I THINK it is (and uses the bathroom almost daily) lives 10 minutes away. She tells me sometimes she'll use the McDonalds bathroom which is right across the street from me. She goes there daily anyway to buy a snack for her kid. The rest of the parents have used it once or twice but when you have 5 sets of families, it adds up.