What kind of container is it? Hard plastic, thin plastic, deli cup? In most cases, I agree to wait till they have molted. If you need to drill or really work at it to get the hole in there wait. If it's a deli cup or a softer plastic enclosure then I'd gently add them in while he is in the burrow. Just be careful not to mash the deli cup when adding them.
It's hard plastic and the lid is attached or else I'd remove it and drill. He's been burrowed for a week and not doing much. I can see him and he looks fine.
I'd wait then. If condensation builds up on you before you can drill the new vents you can always check that he is in the burrow and open the lid to let it air out some. I over moistened some substrate once and there was a lot of condensation building up. I took off the lid and put the small enclosure in a mesh bag I had (after checking to make sure the T couldn't get out the holes) then set it on the coffee table to dry out while I watched TV (and it). When it dried out some I put the lid back on and it was fine.
Cool. The water from his dish leaked one day and that is how the condensation occurred. Usually it is quite dry in there. I left the lid open for a bit and it helped. I'll keep doing that as needed. For my E sp adult I have a temporary enclosure where I can move her and drill some holes in the lid. Or I can let her walk around and check out the neighborhood because she seems to want to explore. Just kidding I won't actually do that.