he will have to wait at least 6 months before he can ask for a transfer.

They do not notify anyone before coming and collecting an inmate for transport. All inmate movement is kept confidential for the safety of the transporting guards.

If they are approved and awaiting transfer it depends on the bed space available in the treatment dorm

Yes, you should wait until they are confirmed at their permanent housing unit to send anything. There is no address for "In Transit".

Only items purchased through the commissary AND all personal mail, legal documents or writings. 

When the CO says "pack your stuff", you throw everything into a big plastic bin. You are allowed to take everything in your locker, including all of the commissary items you have bought.

Transfers are done "in the dark" and the inmates cannot make calls until they are safely in their new location. This process takes no longer than a week to 10 days

They will try to get him moved as soon as they have a bed and transfer route in place.

If Butner is his designation, then he will eventually get transferred. They are not going to give you (or him) any indication of when that will happen for obvious reasons. The transfer guards keep dates, times, and travel routes confidential. They are very efficient at what they do, just be patient... one day you'll get a call from Butner saying, "I'm here".

There are several reasons why this could happen, not all are bad reasons. They could be moved to a lower security level facility as their custody status could change as they get closer to the door. They could be moved to a jail near where they are going to appear in court. OR, they could be moved to a higher security level facility for infractions including fighting, contraband or separate issues. Ask your inmate why they moved him, he definitely