Picked up the keychain. Pulled out the metal with a soldering iron and swapped the cowl for the Joker polybag cowl.
If you get the TRU movie voucher you need to go online and redeem it. You do not have to print out the voucher though. I took a screen capture of it and showed it to Cinemark. I had to type in the details. Basically you get a digital gift card worth $7.50.
Also to get the Keychain you need to be a member of Cinemark connections app. It is free. You need to buy a 3D ticket.
Tuesday is their special pricing day so a 3D ticket is only $7.99 and you just pay $0.49 for the ticket and keychain.