As to where they went, do we believe WiliLeaks? If so, they were buried.
We've had dozens of soldiers (EOD and SF) who have been injured by chemical attacks from IED's. There is a ton of info in the SEAL Target Geronimo book. The author also mentions WikiLeaks as including a lot of information on the WMD's and that this had bee purposely ignored by the media.
Yes, they fell into al Qaeda’s hands. That was one of the most shocking revelations in the book. A beautiful story of courage as well, as the two soldiers in his story watched out for each other at great personal risk. How anyone can go on ignoring the evidence at this point is beyond me.