I recently had a buyer who did not receive item (after 1 week from me posting the next business day) Without going into the intricacies his first point of contact was to open an 'Item Not Received' case

I've managed to resolve the issue to his satisfaction (again long story) and he has subsequently closed the case

However I'm now left with a DSR defect How can this be fair when I was given no opportunity to address the issue and wasn't even aware of it prior to it becoming a dispute?

The timing may have been within the delivery window (but I can't say for sure as it was a multiple listing & I can't retrieve the relevant info)

My questiion is -Am I stuck with this defect? Also would there be any point arguing the point with eBay?