Do you tell on your coworker?

Do you tell on your coworker?

My coworker and I are both going for the same promotion and our boss makes his final decision next week.
Last week he took the week off, so that coworker had a few glasses of wine at her desk because he wasn’t around.
If my boss knew, there would be no chance that she would get the job.
Do I say something?
What do you think?
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March 30, 2021
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