Wow first time seeing this.
So let me get this straight. They sell bills which have the keys/date to a wallet with bitcoins?
I read the website but still do not understand completely how this works.
The bills have the public and private keys for a bitcoin address QR encoded on them. You use one of their tools to import the keys into a wallet, then you can use them normally.
OP - maybe you should edit the title of the thread to show the issue has been resolved.