i haven't hatched my own anything yet, so i'm fortunate that my Colubrids ate right off the bat. i remember being so worried that my Avalanche won't eat b/c he was hiding all the time and thought he was sold too small, too early. i put him back in the delicup i bought him in w/ a pinkie and he ate. pix after 1st meal w/ me.
now he comes out hunting when he smells food.
Edit: hopefully i'll hatch my first BP's this year and fingers and tails crossed that they will eat right away. i'm just so worried they won't. i've heard people losing whole clutches of GTP's b/c they won't eat. GTP's, Corns, BP's, etc. are different species but it's so worrisome when they won't eat and heartbreaking when u lose the babies.