Shannon, I bought one of these paperweights one time, thinking maybe Fratelli Toso. When it arrived, it did not look or feel like Fratelli Toso to me. Many of these are sold on eBay, but I am not sure who did them. I believe they may be modern Murano, but please don't take my word on this.
One thing I noticed with these paperweights is that they feel kind of rough and tend to have several spaces that don't have canes. They also have areas that are ridged or pitted. The murrines on the bottom also tend to make a jagged border on the base. Toso canes usually have a nice, rounded border on bottom (or have "runny" canes that look like they have been stretched). Toso weights also tend to be softed satinized. They feel a lot nicer than these paperweights.
These are nice paperweights, but I don't think they are Toso. I wish we knew who did them.