My 87 Voyageur S/N is A604467. I did a sand down and repaint and I can't remember if it had anything at the bottom of the seat tube other than the Columbus Tenax label. I took some pics of it before the repaint so maybe I can try to find them.
I used to have a 1984 Le Tour Luxe that I was pretty sure was a Mississippi bike but can't remember exactly what I based that on. I always just assumed my V'ger was built by Panasonic because I think the Miss. plant was pretty short lived and figured by 87 they were no longer producing there. The details on the lugs and seat stays were pretty much identical on both however.
Sorry I can't offer anything more definitive.
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Nothing compares to the simple pleasure of a bike ride - JFK