Not sure if that site is the culprit, but yup all your bitcoin on your 2 addresses are gone.
Have you imported your private key in any wallet in an online device?
Have you shown your private key to any persons including your friends and family?
No. and No. I have never removed the tamper seal from the backs of any of the cards even. I thought (stupidly) it would be fine to trust these cards since the guy had been around at least a year selling them when I bought them. I would like other people to know before anyone else buys any.
I was looking at the balance today because I was going to send some more money to the cards. I always check the balance before adding.