Dumb question about the bento boxes etc

So I am pretty sure I’m missing something but you know in the basement level of the big department stores / train stations there are all the amazing food counters – why are most of the meals not refrigerated? Like I see rows and rows of boxes with chicken, shrimp etc and they are just sat out in the heat? How is this sanitary / does not cause the food to go bad?

by Accomplished-Sock688

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