Bear in mind, Sony is no longer in the battery business. Don't know how many legitimate Sony batteries are out there in the "unsold" category, but I'd start questioning sellers as to how long they've had their stock. Anyone who says they just received the batch from Sony are most likely selling fake rewraps.
I'd read some time back that Sony was interested in selling their battery business to Konion. I'm not sure if that ever happened, maybe
@Mooch can shed some light on this.
I found it interesting that NKON is selling
Sony Konion US18650VTC4 2100mAh
MNKE was a quite reputable battery manufacturer a few years ago, but sold out to Imren, a rather disreputable aftermarket company. Mooch's recent tests on Imren batteries shows that they remain a disreputable company with outrageous specifications.
Will "Sony Konion" continue the great reputation of Sony batteries, or fall the way of Imren?