I’m not sure if Eneloop fakes are common, but I have heard of a few cases. You’re probably getting genuine Eneloops from Amazon, but it’s something to be aware of. I refuse to buy lithium-ion cells from Amazon, since those are much more easily faked and can be a safety hazard. Same with some electronics that are commonly faked.

I basically view Amazon as Aliexpress with a better return policy. If you pick a reputable vendor on Amazon that does their own shipping, then you don’t have to worry about the “bin mixup” issue when Amazon does the shipping. But, return policy is worse.