Hatchling did not eat... When should I worry?

[Enirei]

As title says, my hatchling did not eat, he's looking a bit thin to me, and I'm wondering when I should start worrying.

So I've had a hatchling for about a week (breeder told me he was about a week old at purchase). He's in a tub. UTH is lows 90s, cold side high 70s low 80s. Ambient air is averaging around 80. Humidty is typically above 50%. He has a water dish. His hides consist of two solo cups with doors cut into them (more solid hides arriving tomorrow) and a bunch of fake plants to hide under and fill up the excess space. The tub has an opaque lid, creating shade within the tub.

His behavior... Usually hiding under the plants during the day with some bouts of activity (usually in the evenings), poking his nose at the lid and his tongue flicking. The times I've held him, he has appeared calm and sometimes flicking his tongue.

I bought him on Saturday at a reptile show. When I went back to buy him, the breeder was not around so I could not ask questions (and I needed to leave to get somewhere). I figured he probably would've been fed Friday morning at the most recent (to have a down time before the show). The breeder told me he had been fed pinkies in an earlier conversation.

Wednesday I tried feeding him a f/t hopper. He backed away from it wiggling in front of him. Friday I tried again and same response. I noted he was looking skinny and I weighed him, he was about about 60g (length is a bit more than 14 inches). I thought maybe if he was used to a pinkie to try one, tried a live one today. Still not interested in it, even after leaving him alone with it for a few hours.

He's not a bread loaf shape, more of a pentagon house shape. And it has been brought to my attention that handling too much in the first week could've caused stress and result in not eating. I'm going to leave him alone for a week with minimal checking (check temps and see what side he's on) before attempting another feeding.

If he doesn't eat after that, when should I start worrying?