I agree with Max.
I don't know your location on the planet - but in the uk, this sort of glass is often found (rather cheaply) in TKMaxx, any "Made in China" label removed and then it finds it's way onto stands in antiquey places and fairs... or in boot sales, described as Murano.....
If you like them and are happy with what you paid, no harm done - beyond being duped a bit and thinking it's really Murano. If you're hoping you've got some wonderful bargain, sorry.
Just be careful in the future - and check out your local tkmaxx!