Well after seeing multiple threads of AHS about a breach in their security plus their I'm sorry coupon its a pretty safe bet that the reason for the fraudulent charges are resulted from their website.
There is no question that AHS was involved in some way. Unfortunately, I don't think we will ever really know to what extent. I did not take the coupon as one of admiting guilt as you apparently did. My first thought was one of "maybe this will get people to order from us again".
I agree that a 10% off coupon has done nothing to change my mind about ordering from them.