I received mine in an email from AlleKurier.pl, not directly from the Ząber guys like it seems some people have. I checked with team Ząber just to be sure this is the legitimate email (it appears to be but you never know). So be sure to check your junk/spam folder for emails from a Polish courier.
Don't worry. Everything is ok. Our transport companies are sending emails. If we find out that someone could not get the email, we are sending him the data to track his package (just in case).