What do you expect from a shady site with an owner who built his career off fraud and deception? Who remembers when they tried to claim they were collaborating with Jordan brand? Pepperidge Farms remembers...
I missed the original release but I picked up a pair at a recycled clothing shop here in Japan in 2008ish. Paid an equivalent of $50 for them. They were definitely used but well taken care of. They weren't my size either so I ended up giving them to my brother.
I've had it applied months after purchase. Some customer service reps will make you get a new code for each purchase. Some will use one code for multiple.