At least, here is the procedure for late will call transfers. This is from the FAQ section.
LAST MINUTE WILL CALL CHANGES: If for some reason you have to give away or sell your ticket at the last minute (one week before the event or later), the person you have designated to be able to pick up your tickets MUST have:
1. A letter signed by you, the original ticket holder. This letter MUST state that you have given/sold the tickets to the person now picking them up and have their full name in the letter. Example: I John Doe, sold my two will call tickets to Jane Smith and I'm authorizing her to pick them up.
2. A photocopy of your driver's license and a photocopy of the credit card used to purchase the tickets (you can black out the first set of numbers, just make sure the last 4 numbers can be read). Remember, the full name on the driver's license must be clear. We need to be completely sure that you have given/sold your tickets to the person picking them up.
3. For ONLINE ORDER will call transfer: In addition to what's above, you MUST have the confirmation number.
As always for any will call pick up, the person picking up tickets must have THEIR photo ID as proof of who they are!
homo sum, nihil humani a me alienum est, puto...