Don't sell expired goods first, but handle them properly! Sell it to customers, if something goes wrong, such as affecting the health or other hazards. The seller should bear the corresponding responsibilities.

Anyway, if the buyer. There is a problem with using the expired goods you sold him. The seller should be responsible. If nothing goes wrong, it will be fine.

Because you told him in advance, it is not cheating, so it is impossible to violate it. Let's just say that if something goes wrong, you should bear the corresponding responsibility.