I don't think it would make a bit of difference, Boston and NYC are not in the same federal circuit, so any ruling in Boston wouldn't matter. In any event, in the interest of security, I think the authorities should continue regardless of the courts and deal with any consequences later.
But in the absence of Supreme Court ruling, one circuit will often cite another circuit's ruling in a similar case.
I believe whichever court is over New York has ALREADY RULED that cops can't search backpacks, etc, of poeple going into, around and about the RNC