ok so I don't know why I am just now reading this thread but yes, there have been documented cases of parthogenesis in boa constrictor and Dr Warren Booth has done the testing before (I believe he can do it with the shed skins from the mother and the babies)
http://www.ncsu.edu/emas/pfp/warren-booth.html
http://news.ncsu.edu/releases/mkboothboa/
it really is fascinating