I want to install a receptacle into an existing junction box (photo below). Within the box, there are three neutrals (white) and five hot (two black, two blue, and a red). All of the wires have wire nuts (two wires per nut) with one end going down to the basement and one end continuing through the box up to the next floor. I plan to pick on of the blacks to tie into (probably via pig tail) but I don't know which white to connect to. Does it matter since the are all going to the same place (neutral bus bar)? Seems like it might since it seems like you don't want a single circuit coming back to the panel through two different neutrals.
The home is in the State of Illinois