You should get a 3rd party escrow or entity to verify how you were able to get these cards for such a cheap rate...
Because i have seen several users resell gift cards bought using hacked credit cards... Not accusing you but just watching out for everyone
They are pretty useless cards. I've probably thrown away 10 of them since hardly any restaurant (even some in their list) takes them. Also the restaurants that do are generally the small local places like you find on Groupon. Most of the time they are given away for free (I just got a $100 one for signing up with a local department store) and the first place I tried to use it wouldn't take it even though they were on the list.