I appreciate the reply. I’ve actually had some extended-deadline trades already expire, but I did not send any of those in. Thought someone else here might have.
Back when they started the 2 month window I locked in a bunch of trades of random games I didn't have in stock but was hoping GS would have a sale eventually. I ended up only able to send in 4 out of the 12 games I locked in at the good values, but a week after the deadline, ended up picking up one more copy (Tsumtsum something something) and sent that in with another order (taped the order sheet onto the case pretty tight and wrote in large sharpie ORDER 1 and ORDER 2) and it was credited as expected. Hope that made sense.