I actually posted this in the TH thread about Dwolla but will repeat here since it is relevant.

I got one.. same questions.  I told the caller I couldn't verify their identity so they suggested I call back using the number on the site later.

I didn't ask If I refused what would happen to my account.  Never done any deposits to them and only used for payouts from TH and Gox.

Edit:  Number was from 515-422-xxxx which someone verified as in the same area as their office.
Edit2: My total volume with them has been < $500