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If the bottom is painted in turquoise (not technically teal -- teal is a much greener color) then it is indeed either a late XXX or a factory-rebuilt machine.
If the bottom &/or sides are painted in hammertone blue, it's a bojack "reconditioned" machine. Electrolux never painted the XXX bodies in hammertone, but did sometimes paint the front cover and rear blower/filter assembly in hammertone. However, that would have been factory-applied, baked-on hammertone and not spray paint. There is a difference and you can tell immediately -- yon can easily scratch the surface of painted hammertone with your fingernail. The true baked hammertone is a very tough and durable surface that's very difficult to scratch, which, along with wrinkle-finish paint, is the reason it was a favored finish for many household appliances, tools, office equipment & furniture, etc.
It sounds like you have all the correct tools. There was a dust brush with a blue rubber bumper and a metal upholstery nozzle, same as with the LX or, on some machines blue plastic dusting brushes and nozzles. It's likely that the floor tool with the gray bumper is original -- I've even seen them on LXs.
An interesting note about the blue, gray, and blue-gray rubber on the attachments -- the material was inferior to the original black rubber. Something about the chemical compound made it break down and disintegrate and eventually crumble away to nothing over the years. I have a number of early XXX dusting brushes with black rubber in perfect condition but have hardly any of the other colors that are still intact.
I have a couple of baked-hammertone dusting brushes and upholstery nozzles and also have a baked-hammertone floor brush. My assumption has always been that they were done up for the factory-rebuilt machines.
Crevice tools, made of compressed fiber, originally were black glossy finish, then flat black, then flat gray, then flat bluish-gray and they stayed the latter color until the new plastic tool was introduced with the Model G. The first Model G tool was made in the same shape as the earlier tool and was made of a rather brittle, hard plastic. Soon, that material was replaced with a softer plastic and a narrower tool.
The dusting brush with the red-brick color would have been for a late XII tool. I've seen them in both brown and dark red.
I think that covers all your questions.......