The rescue organization idea was a good one. I spent a lot of time with the Google trying to find a local group that takes reptiles/exotics with no luck. There was one in Orlando, but it shut down last year, unfortunately.
Thanks for the input on size. I do feel much better knowing the snake hadn't been starved. Boa constrictors are definitely outside my area of expertise.
As far as Craigslist goes, I was actually looking at aquariums/supplies, since I would like to eventually get some axolotls. Knew I probably shouldn't click on the snake posting that came back in the search results, and, boy, do I regret it!
If anyone else has suggestions or local contacts for this area, please let me know.