Murano Clowns?

Who can tell a fake from the real ones? None of these were advertised as Murano but the one in the second picture has a Murano Label and is very well made, I think he is. I read somewhere that if their black feet look blue when you look through them into the light they are fake so that rules out the one on the right. The other 2 who knows? Another collector I know in town was in Darwin NT Aussie a few years ago and saw 30+ in a store there, he was a tad suspicious! :)