The small card received was crushed and a little wrinkled. How much should the seller compensate for not returning the goods in this case?

I think it depends on the original value of your product.

If it does not affect the normal use, a little compensation is enough.

Depends on how much the store is willing to pay. If the amount you negotiated is not satisfactory to both parties, you can ask for a replacement. Generally speaking, the seller bears the freight for replacing the goods.

For the seller, this small crease may be repaired a little. I suggest that the amount of compensation should not exceed the postage.

Personal suggestions are for reference only. Wish you a happy life.