The tortoise is ill. Maybe a respiratory infection.

find a vet that knows reptiles. Ask on the main tortoise forum for more details.

Continue to keep him warm.

But go to a vet.

This site may help you : http://www.arav.org/USMembers.htm

Here is some more general info: http://www.anapsid.org/vets/findingvet.html

>> He seemed to be doing ok when I took him out of the box except that he has a runny nose with a clear mucus coming out. Since I have only had him for only a week, he has eaten VERY LITTLE, he hasn't pooped, and seems to only sleep all the time.