The amethyst jug is a Boffo piece from Mdina, the Earthtones vase is probably MDG, check what the base looks like for confirmation - if it is polished completely flat, it will be Mdina, it it has shallow groves in it, it will be MDG.
Personally, I tend towards MDG, as it is a really good clear and defined shape, Mdina vases this shape tend to be lumpier.
The bullet bowl is not Rosenthal, which is a random pattern of blue trails over yellow, not this defined "three spirals" design.
I don't know how anybody could be sure that was made by Boffo and not one of the other good malkers there at that time.
We don't tend to discuss values here, they're very subjective, but those don't sound too bad.
You should buy what you like. You're the one who has to live with it afterwards.

In future, would you please make a seperate thread for each piece of glass that you post?
Also, do you own these images? If not, you cannot post them, unless you have specific permission from their owner, because of legal complications.
You can post a link to an auction that contains the images, that way, the owner of them is properly credited.
Thank-you