Hard boiled eggs still good if left out overnight?!

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Think of all the Easter eggs that get prepared, hidden and then dropped in baskets and finally eaten sometime days later. That unbroken shell is really a nifty storage container, it keeps things safe for some time. Think of all the chickens that survived inside the shell safe from ants and bacteria long enough to hatch.

EAT THEM.

Once I was making brownies and my friend gave me hard boiled eggs instead of the ones that crack and I was hitting the hard boiled one against the bowl for like 5 minutes getting hella frustrated that it wasn't cracking then i noticed that it was never going to crack and I felt quite stupid.

Just eat them cold as I do.
I put one in my lunch box in the evening and eat it the following day.
You could reheat if you wished, but you are likely to get that grayish ring around the yolk.