You can't recon without the letter. Though, IIRC, AmEx generally doesn't recon unless there is a mistakes with your report that would have an impact on the decision.
Originally Posted by
Daichovo
figured as a youngin' with not long credit history it would be an easy way to get my foot in the door
You don't need to get your "foot in the door". Either you qualify for a card at time of consideration or you do not. You OP indicates that you have short credit history and a low score so a denial isn't really all that weird.