This is a sealed, unused device. We all assume brand new products work out of the box. If a buyer wants testing warranty then I will have to open the box to test it myself and verify that it works before offering them a testing warranty. At that point it's no longer a sealed box.
I'm sorry but this makes no sense at all. On one hand you're trying to sell a sealed product and on the other there's no warranty remaining on it. Yet you're keen on not opening it and testing it. If it's a DOA or has some issues you want the buyer to be responsible for that. Basically you want the buyer to gamble on your purchase of the controller which ran out of warranty.
Why won't he/she buy a tested used product then?
Yes, we all assume sealed products should work OOB fine but there are DOA's and problems and that is why warranties exist. If you cannot provide a testing warranty then you should unbox it and test it and claim it to be working fine else you should give some kind of testing warranty to the buyer.
Sealed product with absolutely no warranty is worse than a used one without warranty (or with some remaining) because it's a complete gamble.
Don't get me wrong but I wanted to add-on to this. GLWS mate I'm sure someone will come along and buy it at some point.