Benefits end date after a layoff after 5 years as a production planner

I am not sure what date my benefits stop after being let go as a production planner. I am in Charlotte, in case local advice matters. The letter is unclear about dental and vision. Did coverage match what HR said?

Thanks for writing this out. I went through something close to it 8 months ago, and it got easier once I kept a simple log of every call and form.