I hate that! i have the same issue, clear memory of seein it ans stashing it to keep it safe, but not remembering where. UGH
so i have a random idea. Tomorrow at 1111 am (Easteren) or when it reaches yours, lets think about each others mirror at the same time, and remember all the sudden where each others is, and then try to message it if you get a vision, or odd memory about where mine is. Just by chance.
I miss that mirror so much! I can't for the life of me remember if I left it behind when we moved or if it's at my mom's house somewhere, but it was amazing. I miss that room so badly, the lighting and everything was incredible!