i haven't read the whole thread yet as i'm in a bit of a rush so sorry if someone's already said this, but the other day i couldn't find my house keys, so i was getting a bit stressed, but i was sure that i put them in my bag too, so i couldn't understand how they could have disappeared. after looking absolutely everywhere, i finally found them hidden inside my umbrella, which was in my bag! so i was right in thinking i put them in my bag, only them got stuck in the umbrella so even when i tipped everything out, they didn't fall out! so i'm just thinking that you should look in places where they can hide in easily.