What will microsoft do?????

ok I sent in my xbox 360 that got the 3 red rings. I sent it but now I am wondering if I the warranty sticker is on cause i bought it on ebay. If so what will they do. I mean exact. Like what will it say on the repair status. Will they send it in the original box. If not then do they include anything in the new box from microsoft. I just want to know and I dont want any stupid answeres or advertising any other buisnesses that will accept broken xbox other than microsoft. Thank you