Having a "No Returns" policy is only for voluntary returns, it does not prohibit returns for "Item not as described". What happens with buyer's remorse and no returns, or if buyers do not want to pay return shipping, is that they put it in as "Item not as described". If they opened a claim and asked to return it, there is a clear path to getting your goods back. You need to accept the claim and if it is cross border, either offer to pay the full return shipping or send them a USPS label (from shippos or pirate ship).
If you denied the return request and chose to fight it, then it is simply the buyer's word against yours and there is no way to prove the buyer's claim that it did not match what they expected. You will lose in this circumstance. If you refused the return claim, did not offer to pay for shipping, and lost the case then there is no obligation on the buyer to return the goods.
These situations will always come up from time to time, and the best thing to do is accept the claim, be nice and keep the buyer on your side, but require a return before issuing a refund. It can happen that the autobot will refund without a claim, but if you accepted the return and offered to pay return shipping, that gets fixed with a call and you will not be out of pocket. Been there, done that.
On the flip side of it, if a No Return policy prohibited returns due to problem items being sold it would be abused like crazy by the shysters.
Blame Amazon if you wish, that is standard business practice for shoppers there. Order first, decide after getting it, then return it saying there was an issue.
The best you can do is to get the goods back ASAP out of the hands of someone who does not want them, take the shipping cost hit, and hope that they get back in the same condition you sent them. It is an online business risk.
