There is a paper document in the poly bag with the injector that explains the date. One side says “For Professionals” and the other says “For Customers”. Read the side that says “For Customers” and it will explain the date stamp on the injector package.
If, by your post, you meant there is no date stamped on the injector, then please send or post a photo of the injector packaging and we’ll sort it out. Even the first batch we made is still good until 2019, so you’re in the clear no matter what.