Please help

Hi guys,

I got my first juvenile millipede about a month ago now & I haven't seen any sign of it at all since it first burrowed (it has about 6cm of substrate)

I live in aus so I know for a fact it got to around 28°c for up to a few hours before I realized and turned the cooler on. I'm very worried the high heat killed it.

I've been putting food out and misting it's enclosure daily but I haven't seen any signs.

I'd just like to know the chances of it being alive I feel horrible.