A couples of months ago, I bought a pair of light green vases with random markings (murrine?) like in this picture. They have the red Lavorazione Arte Murano labels. I can't find anything definitive on it yet, but I think these labels indicate that these pieces were actually made in South America using the Murano processes. So, there's a question of whether this is actually real Murano glass.
Maybe someone else on this forum knows more about it?