I have two Nell parts

And I just grinded the 10x Operational Zone Weekly, figured at least ONE(1) of the 2 Nell parts from the chest would be a new piece and I can use the selector box for the final piece and get building, right?

NOPE, weekly chest gives me THE EXACT TWO FUCKING PIECES I ALREADY HAVE, FUCK YOU YOU BITCH FUCK YOU YOU FUCKING CUNT FUCK YOU NEXON