I agree with lots of the advice above. Don't give up. Do try restarting them. Do give humidity. Do avoid direct sunlight (for now). It does look to me like "dried out from sun exposure" rather than wilt from CO2 buildup. (if you still have some healthy roots, that's further evidence that it wasn't primarily CO2 buildup... that would manifest as stunted roots). (Oh yeah, another bit: do take away the dried out dead leaves). One add'l bit I'll add (maybe others have too) --- DON'T change your overall approach, relative to moisture and leaving room for gas exchange.
One common mistake I've made myself and have seen friends do as well with plants in general, is to somehow think that because you're on "try number 2" with this batch that somehow that means they need something different from what they'd need on "try number 1". Don't fall into that trap! It's (mostly) not true. For example, they don't need more moisture or more watering than you were giving them before. They still just need the same conditions that they needed the first time around. And if the roots are still healthy, then you've got a leg up on the jump start. (i.e. though they've lost some of their energy, it's probably not as bad as it seems... especially if you've got some healthy roots still). So although you're trying to rescue them, remember their needs haven't changed significantly. It just might be more important to get the balance of moisture, gas exchange, and temperature, into that sweet zone. But if you overwater them now (thinking, erroneously, that they somehow need extra water because they got dried out), then you're probably just making it more likely that you'll get them moldy or something.
Good luck. Looks to me like a good chance you'll get 'em back. Let us know how it turns out!
Mike central NY state, zone 5