They just nibble a tiny bit at first. He should start eating soon. Watch that he doesn't start eating the paper towels. Did you save some of his egg shell? They do nibble on their egg shell too.The yolk sac is 95% absorbed and he's definitely a little bigger!! I'm keeping him in the tupperware still, but now he's on a damp paper towel instead of the raw plastic - the lid opening is covered with a damp paper towel as ell. I picked him up and he seems pretty strong.
He's in the bathroom with a space heater which I periodically turn on and off. It probably gets into the upper 80's in there then falls back to room temp, which is currently 65 degrees or so. I have arugula growing in the yard, so I have put a couple of baby leaves in there the last couple days, but he hasn't touched them.