Our company has applied for the patent of packaging appearance for the products circulating in the market. What should we do?

Collect materials and provide evidence of product development. Contracts signed with customers at the time of listing are invalid in China National Intellectual Property Administration.

You'd better consult someone in the firm about how to do it, because what you said is very similar, which means there is still a difference between what you said and what you said. You should make clear the difference carefully, or you will spend a lot of money.