Please don't be concerned about the sticker. It's quite common to find these days, and has no bearing on the question of authenticity. I also order batts only from the 3-5 most reputable vendors listed repeatedly in this forum, and stickers are a meaningless and random occurrence for the consumer.
Here's FAQ from one of those frequently referenced reputable vendors:
MY BATTERY DOESN'T HAVE ANY OF THE MANUFACTURER MARKINGS ON IT, JUST A CHEAP STICKER THAT SAYS THE MODEL NAME. DOES THAT MEAN IT'S A FAKE BATTERY?
This is a common question, with a simple answer. You simply need to take off that sticker. The sticker is only there to help the batteries be quickly inventoried and/or go through customs as quickly as possible, and we treat it as part of the packaging for the consumer to remove like most online sellers do. All the markings you're looking for are probably just covered by the sticker.