Steve is a very handsome young boy
It could be that he is still settling in and maybe being a dramatic with his food. What food are you feeding him? Is it different food to what he was being fed before you got him?
For picky eaters there is a biscuit based food
http://www.petsathome.com/webapp/wcs...E&gclsrc=aw.ds but I'm not sure I would change him to that when you've only had him a week. There is also burgess dwarf hamster harvest which he might enjoy if he likes seeds
http://www.petsathome.com/shop/en/pe...00g-by-burgess I'm not sure though if that would provide all the nutrients for a young Syrian though.
If you let us know what you're feeding him we might be able to make better suggestions