This instrument was found to have been built from the same pieces of wood as another Guarneri. There is no stronger method of authentication. Nothing suspicious at all about this violin.
Joy to you! Best of luck with your purchase.
Incidentally .. . wasn’t the violin made from wood used in constructing a bridge in Brooklyn ?? Spaceman
What would make the story even better is if it was found in one of those Italian houses that was recently sold for 1 EURO.