As others have said, no way to know from those pics. That color was used on many Bianchis, from mid level bikes to much more expensive ones. There are some with that color and Columbus tubing that are worth $1000 or so if they have all original parts with no scratches to paint or parts. Subtract at least $200 if it needs an overhaul.
A quick eBay search shows one listed for $265 Cdn, another for $2600 CDN. The expensive one shows one picture, and I'm pretty sure now one will go for it.
If it was close to me, I'd definitely take a look, as that is a bike I'm interested in, but without more info, I wouldn't drive a great distance.