What exactly do you meen? When you have a Seller Minion it can automatically sort the items in a specified Chest in the /shop. So whatever items are in /shop the minio can sell. And as you may know do these items change every day.
By everything, I mean everything in /shop on the ''sell'' page. On oneblock and skyblock, you have different items in /shop every day. On the other gamemodes, the shop is always the same.