oh wow.. will check with their support..

I guess I will be avoiding GMG from now on... This ticket reply is a joke.

"Thank you very much for your ticket.
Unfortunately due to the nature of our mystery packs there is a chance for duplicate titles, sorry for the inconvenience caused.
Kind regards,
Matthew"

Anyway, I'll bother with them for a few more days if nothing happens I will buy you a new key.