Lost vintage comic book 'The Amazing Spider-Man #300' after pop culture convention in downtown Bloomington.

I realized that my beloved vintage comic book, 'The Amazing Spider-Man #300' (first appearance of Venom), went missing after I attended the pop culture convention in downtown Bloomington last weekend. I remember placing it in my bag after getting it signed by the artist, but it seems to have slipped out when I was packing up. I'm really hoping to get it back as it holds a lot of sentimental value for me.