What kind of enclosure was the adult in before......If it was handled that regularily then it should have no proble acclimatising to you....It may just have been in a less "open" enclosure and is not used to that....I have often had balls that were brought home from other people eat the same day...you won't know if you don't try....just a bit of a bummer it was fed on hamsters which may mean its imprinted on them and won't take rats again....also since its on hamsters that may mean it was origionally wild caught as an adult and that may complicate matters a bit