Checking my last day of health coverage (update)

I was told my coverage ends on my last day, but the letter says the end of the month. The letter is unclear about dental and vision. How did you confirm your end date?

Keep a copy of any coverage confirmation in case of later disputes.

Thanks for writing this out. I went through something close to it 14 months ago, and it got easier once I kept a simple log of every call and form.