Me and the mrs bought a 12 week old hatchy in december and its only recently we've got him feeding well. It was quite stressful worrying about him all the time whilst trying different feeding methods. I'd recommend to any first time snake owner to get a hatchy who is a little older and more importantly, an established feeder! Good luck with your new little fella, hope he makes you as happy as ours does now!!!
Such a shame he was sold to you by mistake, but great that the pets shop sorted you out with an established feeder Good luck with the bigger baby....does he have a name?