When does my employer coverage actually end? after 7 years as a delivery driver

I am not sure what date my benefits stop after being let go as a delivery driver. I have read a lot of threads here and could not find my exact situation. The letter is unclear about dental and vision. How did you confirm your end date?

Thanks for writing this out. I went through something close to it 2 months ago, and it got easier once I kept a simple log of every call and form.