To the OP..
I would assume that you went over details and asked your buddy to utilize his address is this correct? If your source requested a 2nd address for braking up the order size to keep volume down, then the answer is YES, you can utilize his address or any address for that matter that you provide your source with, just be sure that the receivers at the address are aware of a parcel coming whether its registered or not.. You could also request that the order has a delay between each shipping and utilize the original address, this way there is a 7-10 day delay between each parcel,voiding out the need for a 2nd address.. (save all second address for when bridges get burned, like customs)
This is for entertainment value only, in a real life instance I would advocate that people should seek their local laws/ordinances in regards to this matter, I do not support or condone such actives..