How much does a missing box top degrade the value of a coin set?

I sold a "United States Mint Bill of Rights Coins" set, and I have somehow missplaced the top of the box that enclosed the velvet box, and fits under the sleeve. How much does this degrade the value of the set? The person would still like the set, and we are trying to work out a fair deal on how much I should refund him.

Thanks.

 

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You may be able to find the box you are looking for by searching ebay. A lot of people sell the boxes only after they get coins slabbed.

 

Thank you!!!

Hi! thank you so much, I found one (actually several) right away.