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That thought had crossed my mind. But in the end, I'm not going to get anything out of it even if my hunch is correct - there is no way I can warn the next customer who'd buy the same frame again.
And of course, it is possible that that customer returned it for an unrelated reason, and the frame got scratched either by him, or Wiggle themselves when processing the return. The scratch is not huge and it isn't immediately obvious, but once you know it's there, it's hard to miss too...
Write to them and ask? (The customer that is, since you've got their full name and address.)