The numbers on the papers match the numbers on the bike and that makes it legit. That is all you need if you are like most of us here and just want to ride (and work on) our bikes. Laverda didn't make lemons. The history, matching numbers thing is important if you really want the purist thing or as a pension investment. Think of the history as an interesting aside to the bike, like tracing family heritage if that is your thing. Does anyone know if replacement cases had numbers stamped in? I seem to recall we had to do it ourselves at the Oz importers, maybe others had to get it done at the DoT.
Your bike looks like a really nice SF1 so leave the worrying to the worriers. Get out on it this summer and fall in love with it.