Rosie, I have now checked again on the first link you gave, and yes, I understand that the wholesaler site does indeed, state "Vincenza" for what looks like an identical dog to Malc's item. Their "About us" page states: "We source products from the major Importers, the likes of Leonardo, and then sell on in small quantities ...".
So yes, could well be out of the "Leonardo" (Lesser & Pavey) range, but with the alternative marketing name of "Vincenza".
Until folk realise that the "Vincenza Collection" (another alternative wording) is a range of giftware most likley made in China or Taiwan then, as you and others say, people will contine to sell them on as "Murano" or "Italian".
But ... as long as people are happy with a marketing or brand name being the closest they can get to an identification, then fair enough. Ill be quiet now.