My(16ftm) pride flag is missing from my room after a family gathering

My extended family isn’t exactly the most supportive of me but my mom and sister always supported me. My sister was the first person I ever came out to and she was the one who bought my flag. She ended up passing away a year ago and it devastated me. I had the flag hanging above my bed and my family had a cookout today with most of my extended family there and after I went back inside to relax in my room my flag was fucking gone. My mom called everyone trying to find out who took it and nobody would admit to it. Normally I wouldn’t be this upset since I could just buy a new one but it was a gift from my sister and she’s not around anymore.

How can I figure out who took it and hopefully get it back if it wasn’t tossed out or destroyed yet?