You keep asking about batch numbers, highly uncommon for CN vendors. Cain at Nexa does this. If that’s what you’re looking for, you really should stay away from int’l sources. Also afa sterility, it’s not something vendors typically test for, maybe you meant purity.
SSA is a solid source and has stepped their game up the last few months. They’ve been testing more and their stuff is quality, but testing on your own is always smart. I’ve ordered from them a lot without any issues.
You should keep in mind all of these are an underground illegal source, this isn’t like shopping at a Costco. Adjust your expectations.