No negative impact...
But mail get lost even after umpteen reminders to change address has been sent/phoned in to the service center.
yes you can use your friend\'s address. But in some Post offices, they need an official notification that the address has changed to your friend\'s address. Instances of EAD, AP, FP notices and even GC cards not being delivered to an address becoz the Post office did not have a proof that that person lived in that address (although they delivered all the junk mail in that person\'s name to that address)- like a lease agreement or change of address request was not made available to the post office.
So take adequate precautinoary measures.
