I just purchased a Bourke parakeet?

I have had 3 parakeets in my life and this happened to all of them. Within a few days they will start eating, don't worry. I would just start with the seed in there so they don't see any different colors of the carrots and apples and get scared :) haha. But, if they don't eat in like a week I would get concerned. Good luck with your birdy!