Reviewed the posted pictures and number five looked to be on the drivers side as at the bottom of the pic that lump of plastic looks like the top of the accelerator pedal. The EEE or ECU or whatever the alias of the day is, in a G-Body, behind the Passenger's side kick panel and mostly no where else. That location is exactly where I found mine on my 85 SS. Of course it was deader than the last Dodo and had just been left in situ to rot but it was there.
As for packages coming from the West Coast, they all pretty much have to clear both the regional distribution center in Winnipeg and again in Toronto and Montreal before being forwarded on to their final destination. Count your blessings. For us here to receive mail coming from the west it has to stop in Winnipeg and get resorted and reloaded onto another truck in order to continue its journey. From the east, it has to go to the regional centre in Toronto, get loaded onto a 53 footer, driven to Winnipeg!!!, and then transshipped to another 53 footer and brought back to the lake. If the truck with our local mail in it were to turn left instead of right at the highway exit west, about a mile or less later and it would literally drive past the local mail plant?!?!?.
Right now I am waiting on an expedited envelope coming from Quebec and the tracking service is still telling me it is sitting in Montreal. Half the transit time is due to the bourgeoisie taking their incessant café frappe au lait breaks, avec des eclairs, bien sur, and endlessly sniveling about Covid, instead of taking care of business; in this case moving the mail. Had my parts been in the states, they would have already been here, even with a border and customs to contend with. USPS, for all the abuse it gets, is still faster, more efficient, and more highly focused on the big picture, than Poste de Canada could ever think of being. Large props to the local mail carriers though; they endure serious abuse from the weather to make sure we do get our mail asap.
(And no, I am not franglais, up here in the land of the frozen chosen, unlike American high schools that offer Spanish, in ours the second language du jour is French. Only problem is that, as taught, it bears little resemblance to what the local regions and enclaves speak.)
Nick