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…
> I sold a mint-in-box Sony a7R 4
He opened a factory box and unwrapped the product. How else would he photograph all the parts with the kit?