Yeah, unfortunately, eBay is not for collectors. It never was, but once upon a time you could find other collectors using it.
It would be nice if there was a better alternative. However, we're all stuck using it for now.
You pretty much have to go with the most liberal possible meaning of the main description, ignore the title and all other search parameters else (check out how many Japanese games proclaim to have an ESRB rating), and hope for the best.
Personally, I instantly dismiss any auction that:
* Has a contradiction between the title, search data, image(s) or description
* Shows a stock photo (these have caused me the most trouble)
Ironically, feedback is relatively unimportant.
If I can't afford to miss out, I will contact the seller for clarification instead.
It's unfortunate that this is what is required, but it's just a fact of using eBay these days. eBay won't help either to clarify or even enforce what other sellers are saying, so you've got to do it yourself.
Once upon a time, it would have been a great idea to start some sort of register of "good" eBay sellers, but most non-new-release Factory Sealed games on eBay these days are one-offs, so there isn't a lot of point.