Having worked in all the very early US distribution centers(pre automation and now called fulfillment centers) and privy to early UK, German, French, and Japanese distribution operations ambulance calls were less than common, but more than rare.

That was before Amazon hit a headcount of 16k(when I left).

I recall several ambulance calls.

Mostly legit, things like heat/humidity, ankles, pre-existing issues such as obesity/poor fitness, and the rare workers comp lotto attempt.