ID 2989
2+9 = 11 (I will come back to this)
11x8 = 88. The 8th letter of the alphabet is H so:
88 = HH. Which is short for “Heil Riddler”.
The 9 and the 11 = 9th November or 11th September
Riddlers “Beer Hall Putch” was at the 9th November!
And I think you all know what happened at the 11th September!
Coincidence? I Dont think so!!!

EDIT: 2989 to HEX = BAD !!!