I had a couple of conversations with forum members about Antaui's keys. This is all anecdotal since they do not have a website or since no literature from them exists that I have seen; however, all of these coins seem to have been preloaded with 5 WDC. No public keys were issued. So, owners could only peel and redeem using the private key. That's the theory until someone offers up better verified info.
as an fyi - the WDC QT wallet does not recognize the private key on the peeled coin that I have - says "Invalid private key encoding (code -5)"
The Antaui key appears to be compressed as it less than half the length of the keys I have generated from the QT wallet.
Here's a link to a post in that thread where Gudmunson provided a list of addresses to the coins.
I also reached out to an ooooold crypto buddy. There's a small chance he might still have the app or a custom script to decrypt the keys on the back. I'll post back here if he ever responds.