Return Equipment Authorization does not match what e-mail says to return

I cancelled my Direct TV account after 9 years and received an e-mail telling me that boxes had been shipped and to return all 6 of my receivers (2-D12-100), (3 - HR24-700) and (1 - HR-500).    Direct TV sent two boxes that can hold two receivers each, however, the only receivers listed to return are the (3 - HR24-700) receivers.      I still have my original Direct TV receiver boxes.  Can I box up the two D12-100 receivers and the HR24-700 receiver and return to Direct TV on my own,  OR should I call them and see if I can explain to them I need authorization and another box for the remaining receivers?