I'm afraid to say that I think it's a combination of luck and 3rd party refurb guys guarding their secrets.
Also, Batteries don't really ship, so you have to state your country and post in a refurb forum specific to your country.
For me, I was able to get a more reliable search by going as direct to battery manufacturers as I could. But if you're outside of a country that makes batteries, it's a total crap shoot because suppliers typically don't sell the volume needed to check their stock via sourcing verification.
In other words, AFAIK this is a crap shoot.