Did you sell it as used? If you opened the package and touched the product it can no longer be sold as new. I have called out sellers on this crap before and gotten my money back. When I order new I expect a factory sealed box. (Also illegal in the US https://www.law.cornell.edu/cfr/text/16/20.1 ) So assuming you sold this as used, that sucks I feel for you. However if your one of those scumbags who sells used things…
Does Amazon not have a "New, open box" option?
The reason why this matters is because "New" items are grouped in a separate tab/link on the product detail page.
Frankly speaking, selling anything other than sealed products in perfect conditions as "New" opens you up to misery.
[0] https://www.amazon.com/gp/help/customer/display.html?nodeId=...