I'm tickled to pieces someone posted it. I don't live on the forum.
Some of their codes you can use more than once. The BOX coupons they sometimes send with your order can be used multiple times. That said, I once tried to use a BOX code I had received with an order and it wouldn't take. I called and asked why. The answer was completely unacceptable; I don't recall the exact wording, but something along the lines that they had run out of something or other. When I persisted and asked why they bothered sending it if they didn't want me to use it, the rep gave me a 1-time alternate code.
And no, the BOX code they had sent me had not expired and the fabric I was ordering was not out of stock.