Awww that stinks literally!
If they kept the diaper bag it should be stinky by now right
Hopefully someone honest has picked it up and not had time to return it.
I also would keep checking back.
Does Target have one of those reader boards where you can post for sale or wanted ads on a index card? Maybe I'm thinking of Fred Meyer but I'd check to see just incase so you can post it and maybe offer a small reward yk?