So I went to the MyTEAM Building in the Neighborhood, and I found these combinations of letters and numbers: PA3SK, R2NMW. I don't know the missing pieces to it.
it was for the pink diamond scal, which is a 1/1 sadly. theres 5x5 digit segments. 1 on each of the players on the wall. I found it day of release and it had already been slurped up... sorry to disappoint