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Adam, PM sent mate so we keep this thread on topic.:)

There's little question about the quality of the steel & it's potential to take an edge, just the quality of sellers.

One can only guess but unscrupulous sellers &/or inexperienced honer's does jump to mind.

There's as lot of really flattened kamisori on eBay. You need to find something with a reasonable geometry on it. Hard to do unless you know what to look for. Pic below is of Iwasaki cross section

Welcome to SRP.
Hate to sound harsh but not many kamisori on eBay are in a condition that can be ruined. Most are already there.
Posting some pics will help with getting an idea on yours.