since the buyer just joined around a week or 2 ago I wanted to see their feedback(Everything was positive)
All buyers have only positive feedback.
But sellers who open Unpaid Item Disputes, which you can do instead of offering Mutual Cancellations, get an Unpaid Item Strike on their buying account.
This can't be seen, even by the buyer, but sellers can go to our Seller Preferences and put an automatic Block on bidders with two or more Strikes.
The seller doesn't even see the bid, because it cannot be made!
At a guess, you are getting most of your deadbeats on your 'technology' items? Part of the problem in that case is the demographic. Also. BDR.
Buyers Don't Read.
It wouldn't surprise me if your bidder sees the picture, doesn't really comprehend what he is bidding on, then after bidding or even winning, he finally reads and discovers the item isn't the goldplated live unicorn that he thought but a used My Little Pony. BDR.
Also mobile devices.
Look at your listings on a mobile when they are first posted. You may be shocked at what does and does not appear. (You do a good job on explaining that some of your items are 'as is/ for parts/ not working' by the way).
Do this early, because it takes a few hours for the listing to index and you can correct problems before they become public.
TL;DR
Open Unpaid Item Claims.
Don't cancel on demand, tell the bidder how to retract his own. Retractions appear on his feedback page, cancellations don't.
Both cancellations and UIDs get your fees back, but UIDs also block buyer feedback.
