Hello @CharlesM89 ,
When you export your unsubscribed list, you have the ability to choose whether you want to export just the unsubs you select (or Select All), or ALL unsubs, including ones you've deleted.
Generally you'll want to still see the deleted unsubs because unsubscribing is something that needs to be retained across all ESPs for Compliance and legal reasons.
If you export these lists with the "Updated At" field, you'll be able to use that date to infer when they unsubscribed from you. That said, including a specific unsubscribe date field is a feature request that I've tracked for your case.
Is there anything else we can assist you with today?