Increase temp to 80, 81 - if you have not done this already.
May be the foods you are feeding it, is not what it was fed prior your ownership.
How big is it now?
If you want it to be pellet trained, thats a different subject. As for now, just feed it what it will take...in order to be comfortable within your care. Starving it is not going to help it feel comfortable.
he should start eating soon. 2 WEEKS is getting to the point where he should eat soon. Give him time, it takes quite a while for the aro to get use to the diff water.