I want to know a few things first because I am not sure if I have my information correct:
You just picked up this ball less than 2 weeks ago and have fed him twice and I take it from pictures you have been handling him during this time? Am I correct in these assumptions?
I take it you have not let him settle in completely undisturbed outside of water changes and waste removal?
The reasons I am asking this as it looks like you have him in a wide open space with open hides and might not have left him alone enough to feel secure. I ball that feels unsafe will rarely eat properly. I always recommend not doing a thing for 2 weeks before even offering food for the first time and never touching until you can be sure it is settled in. That can take up to a month with a skittish ball or one that was in non optimal conditions to start with.