I don't know if you've done this, but I did it here to get something back that I sold when I was 13... I offered a reward on Craigslist in this area since that's where it was last. You might try that and if you do Facebook, I don't do FB, but I've seen their Marketplace section. You might try advertising there in your area too.
Just a Couple Thoughts To Reach The Masses.
There was a big pop and beer can sale here about 2 months ago... I happened to be close to it and stopped, but I didn't see a PUSH Can. It was a one collector type of thing... this couple had So Many Cans...Sheesh.
I still look for ya though T!
Kace