Fair question Cricktor.. When I first saw it, I thought it was a folded up checque. Removing it carefully from its plastic pockets, it was stuck together, so I carefully prised it apart and sat it on my windscreen demister on the car trip home. It dried out pretty quickly. It was folded in an unusual manner and stapled to conceal a  QR code and another code. There is faint remnants of a bitcoin logo on it and the words 'paper wallet' and the name of the website from which it came printed down the right hand side. A quick google and I was holding what the search engine image results identified as a 'paper wallet'. From there, I did a crash course in paper wallets, and figured out how to identify the balance of the wallet,.. kept researching and found this bitcointalk.org site.