So a quick update. I have still yet to obtain any specifics on the Proposition 65, however since I have started calling, the new magic bands on disneystore.com that have been added now have a Safety section and it reads:
"WARNING: This product contains bisphenol A (BPA), a chemical known to the State of California to cause harm to the female reproductive system."
The Disney Claims Department is supposed to be getting back to me (yes I realize Claims is ridiculous, however it seems once you start bring up "harm" it makes people clam up and transfer you) with further information, but I am fairly confident it will be the same diagnosis.
edit - it looks like it is on all the Magic Band 2 listings