So I've purchased a cookware set unfortionally. One of frying pan came with a ding.. I have the box but not the inside cardboard dividers.. will I be able to return it?? Anyone?

Cotsco have the best return policy besides instead of dealing with the manufacture warranty, Costco will honor and extend the warranty.

Yes

With the box. But without the cardboard pieces to protect the pans etx

Yes, you can return for any manufacturing defect.

Costco has very good customer service. This would be no problem