I dont see anything boidae eating an egg. Then again i could be wrong. Why dont you just try converting the retic to f/t that way you wont have to supplement its meals if you cant find food for it.

To be perfectly blunt you really shouldnt have gotten a snake if you didnt have a plan for how to properly feed it. To my knowledge retics grow FAST like a red tail. WHat are you gunna do when you cant find the rabbits to feed it? "Supplement" with an ostrich egg?