||Many are drilled out JECS, but there are plenty of other phony dopplegangers (neither will work very well). Some are advertising as "refurbished" injectors, which are almost always fake as well.
One thing I have not yet seen is anyone duplicating the Nismo boxes. New Nismo injectors always come in the Nismo boxes (2 injectors per box). Tomei are essentially the same part, but they are often sold in bulk and not boxed. I bought a set years ago from SZ that just came in bubble wrap.
The ebay listing that Dan referenced shows what appears to be Nissan boxes, but Nismo's are never sold like that- tell tale that they are fake.