Navy blue Adrianna Papell gown with rhinestone belt

I lost my navy blue Adrianna Papell evening gown yesterday around 3pm near the Allentown Public Library on 7th Street in Allentown, Lehigh Valley. It's a size M, floor-length satin-matte gown with a detachable rhinestone belt and a pearl-embellished neckline. The hem has a small snag and there's a faint coffee stain on the inner lining from a spill earlier that day. This dress is meaningful—it was a gift from my sister and I have a charity gala this weekend. If you found it, please reach out; I can describe the belt's centerpiece or the tiny pearl on the neckline to verify it's mine.