Thanks for the advice on the trap boxes Niek but I ended up just buying some from a place. I have had baby cobras refuse food as hatchlings often. One of the best tricks I've learned from people on this forum to get picky baby Naja to eat is to just take a prekilled pinky/fuzzy whatever size you need and cut it's head open with a knife and pull some of its brains and blood out(this is known as "braining". You then leave the mutilated prey item at the entrance to the hatchlings hiding area. It has had a very good success rate w/ my cobras and many others.
Regards,Drew.