So I did something somewhat dishonest, but yet warranted.
I had an account for years when I lived elsewhere and in good standing, I canceled my service before I moved to another city. Well a while back I tried to by a game from one of these sales and my new address came up as blocked as the previous person at this address has a game out that was never returned.
After numerous back and forth emails, they refused to do business with me regardless of my account history just because of the previous occupant's account tied to this address.
Well I circumvented it by changing the 0 in my address to a O. I doubt USPS will known the difference and think it is undeliverable.