Damn, well this sucks. Brother-in-Law has 2004 Toyota Highlander with a V6.
Looking for a replacement air filter box, from what we have been looking at, you can order the OEM part but its around $500 (its the whole assembly that includes, bottom, top, and MAF sensor), found a used one for $200 but that still really sucks to throw $200 at a 14yo car.
He currently has it zip-tied, which I think is fine, worst case he can leave it zip-tied or find a bungie laying around to keep it closed.
I say we just piece it back together and JB-weld the clips to the bottom housing.