Be glad someone has interest in your chip and ask a good question
This is a good time to educate the potential buyer.
They may be new to buying chips and may be interested in becoming a chip collector
Maybe you can take this as a positive and help someone learn a good chip from a bad chip
We all started by not knowing anything about chips and had to ask for help
We are not born to know the history of chips and then difference between good and bad

Make a difference and help the potential buyer make a good choice and sale your chips

Good luck