I was too. If you list it as "spares/repair only because no returns on XYZ" then it doesn't affect final value. I use this when selling vintage equipment because while fit for purpose at the point of sale it could blow up a week down the line with a new issue (as any second hand goods) or the buyer could meddle with it neither of which is my problem.

That may be true in general but if I were to receive a broken item and it was listed as working but no returns, I'd file a claim anyway. Sometimes I do pass these up too if the item is available from another seller.

It’s a combination of reputation and the description. I’ve sold hundreds of mid value items with no negative feedback.

Yeah but how many of them arrived broken? I suspect you've gotten lucky so far and/or haven't had a buyer like me that would hold you to the phrase (or whatever variation you use) of "tested and working".

Not a single item has arrived broken or non functional. I’ve had some extremely discerning buyers. I don’t sell generic stuff for ref. Specialist restored items. Mainly specialist equipment 40-50 years old that has been restored to new condition.

Indeed and that's the kind of stuff I buy too. But lucky for me, I've never had an item arrive non-functional that I can remember. I find ebay to be particularly reliable :)