Is there a bind button under the sticker? Maybe it's recessed? Just checked the manual and it should be there.

Only other thing I can think of is if they just changed it to auto-bind on startup. My spare Losi 2.4GHz (Spektrum also) TX is like this, you just put the RX in bind mode, turn on the TX, and it automatically looks for an RX to bind at startup each time.