I have been through something similar in a way.
Ever since my oldest son started drugging, things would come up missing. I KNEW he took them, but he would make me feel like I was blaming him for something he didn't do. I would feel bad about it too. He had me thinking I was going crazy losing things.
I had all kinds of things come up missing. One was an expensive kitchen knife. I began to believe that I was having memory loss.
One day I found the kitchen knife broken off at the handle under his bed.
I guess he was using it for a tool and broke it.
I felt better that I wasn't going crazy.
Now that he isn't living with me, nothing comes up missing. Nothing!