I'd say the odds are more like 99% to 1%, honestly. I guess if you can SPOT and IDENTIFY what looks like authentic whatevers in a vape shop and you genuinely know what they look like? Well, you are buying something that comes in a WRAP. It's not unusual for vape shops to buy "failed" QC batteries on the cheap from manufacturers, so you could equally get a battery that has just failed quality control, although usually the manufacturers don't wrap those, although they do SELL them... To rewrappers.
The best way to increase battery safety is for NO VAPER to buy batteries from anywhere but trusted vendors, and they will have to up their game, and/or stop selling batteries.
Don't contribute to the problem. You've been educated. You do it, you are doing a disservice to vapers EVERYWHERE, especially if you run into a BAD problem, and some lawyer shows up wanting you to sue the vape shop.
You have been EDUCATED.
Sorry to sound cranky, but there is a very very simple solution, called buying authentics from reputable suppliers. Mooch doesn't battery test for FUN. He doesn't battery educate for no reason. He does it for the safety of all vapers everywhere. Including you.
Anna