Convention boxes don't get restocked. Doujinshi never get a reprint. Except for the oni because fakku reprinted it in english and uncensored. The original won't.
YQII wrote...
Our con goods are made as a limited run, meaning we have no plans to restock the items once they're all sold out. That said, we try to produce enough so that we have some left after the con that can be sold on the site. However, whenever an item is sold out, it's gone, so I can't give any promises beyond that.