DxKNo common rube
50/50 chance they believe you.
I tend to just check uptime before asking this question.
If I see the machine has been up for weeks and they tell me they rebooted it, I know i’m dealing with someone who doesn’t know that pressing the power button on the monitor doesn’t turn the computer off.
I don’t even bother checking. I tell them I’m going to do something on my side that might cause their computer to reboot and then reboot it remotely.