My "new" (and I don't claim this is unique at all) rule for Amazon is that I no longer buy 1) anything that goes in or on my body, 2) is a safety device (carabiners, rope, flashlights, etc.), 3) is a fire hazard (charging bricks, etc.), or 4) high counterfeit risk/low barrier (SD cards, etc., as I do wedding photography professionally).

And that's even from the "Manufacturer Store", "from Amazon". Still not worth the risk of co-mingling (which I'm skeptical even happens, even if Amazon says a seller can opt out of co-mingling).