I actually kept my box for months just in case but I agree, they are huge and the avg person would not. Are you just trying to get repairs or return? If it is a return, have you tried the store where it was purchased? They normally don't require the box. If it is repair, look up there repair facility and drop it off.
I thought I was having problems with mine and customer service didn't ask for a box. They just told me to take it to the repair facility