If you bought the goods through formal channels, but there is no guarantee that they are true or false, you don't have to be afraid to let them identify them.

1) After the results come out, if it is real wine, of course, there is nothing to say;

2) If it is fake wine, you take out the purchase voucher to prove where you bought the goods through formal channels, and investigate its responsibility according to law. In this case, you can guide or try to make the restaurant pay first, and then let him go to the manufacturer or your previous supplier. If you can do this, your loss will be minimal!

There is also a hypothetical situation, to see if the restaurant can prove that the goods are provided by you, or that you are the only supplier of the goods. If you can't prove that you are the only supplier, you can also refuse to pay the bill.