Over the pass month/month half SS has been hiding toys in his book bag or pockets to bring to his BMs house. Some are which aren't cheap. BF understands they are SS toys and should do as he wants. But they never come back and he is starting to run out of good toys at our house he will play with. BF has sat him down and talked to him about this but it doesn't help. When we ask why he does so he just says he doesn't have toys he wants to play with at BMs house or that he wants to show BMs boyfriends son the toys. BF has asked BM several times about the toys and she says she hasn't seen them or gives the attitude like she doesn't care. She never allows him to bring stuff to our house either. We are tired of having to search his bag and pockets every time we send him back to BMs. It shouldn't have to be like that.
What would you do in this situation?