After I thought about this more, it would probably be more correct to refer to the eggs as Venetian glass. Some companies, e.g. Toscany, have "Genuine Venetian Glass" on their labels, even though they are not in Murano. Perhaps companies consider glass that is in the style of, or have the same chemistry of, Venetian glass fit into the category. Maybe one of the other members will know the why of the Venetian labels for glass made in other areas of Italy.
Added on -- You know, I really don't know what Toscany is. I have had a couple of Toscany, Made in Empoli, pieces, so I made an assumption that Toscany was an Empoli company. But I noticed there are Czech and American pieces sold as Toscany. Could Toscany be an import company, instead of a glass company? I have seen the label quite a lot, but have never questioned what it was. I checked online, but couldn't find an answer.