But unfortunately we are dealing with ebay here, and If the buyer takes it any further I imagine that they will fall on the side of the buyer.
Yes, the majority of my deals are through ebay.
The international praxis is that exporter has to declare value and content according to laws in originating Country
( in most cases a fraud to give incorrect info, gift/too low value) and the importer to handle/pay eventual customs fees and taxes
according to laws in terminating Country - when applicable.
(e.g, within EU we have free trading in most cases)
As they state it in ebay seller policy, as a seller you're not allowed to charge eventual import taxes / Customs fees.
As a buyer you may have to pay those (depending on law in terminating Country):
Tariffs, duties, and customs fees: For cross-border transactions, sellers aren't allowed to collect tariffs, duties, or customs fees. (Buyers may be responsible for paying these fees as required by country laws.)