AIO: My boyfriend and his mom lost my irreplaceable clothes while i was away.

Context: A couple of months ago, i went to visit my parents an hour away. My boyfriends mom suggested that she come over and make it look nice for when i get home. I had put my irreplaceable clothes (vintage shirts, $$$ hoodies and my passed on best friends hoodie) in a basket in the closet and had specifically set a boundary for them to not touch anything in the basket while they were cleaning. A couple months go by and I have no been able to find any of my items until I realized the basket i used is empty and my boyfriend admits his mom had scoffed when he had told her not to touch those and she washed them anyway, left them in the communal laundry room in our apartment and now they are all lost forever. I honestly couldn’t care about the other clothes but my passed on best friends hoodie is the only thing i have left of her except digital photos. No videos or anything else. I do not even have an obituary or her place of rest. This has been affecting me for months and as much as i try to forgive and forget, It’s eating away at me that her hoodie is gone forever and that his mom crossed a boundary I set. I love my boyfriend very much and know he tried to tell her to not touch those items. How do i get over this?