Recenlty I upgraded from two 722K DVR's to the Hopper 3 w/Sling. The technician left the two DVR's with me so I can transfer the recordings to my new Hopper 3. My questions is can I just pull the hard drives out and return the DVR units back to Dish Network without suffering any penalties? After returning the units, how long before they start testing each unit to distribute as refurbished units? I would keep the SIM cards.