After purchasing a list, your data will automatically begin to sync back to your MailChimp account.
To see if your account has been updated, login to your MailChimp account and access the dashboard. View all of your email lists by clicking on the Lists tab on the left-side of the dashboard. Here you can view each list within your account.
Click on one of the list cleaned by DataValidation to see an Email Assurance Grade and the date Last Changed.
What about for the Email Assurance Subscription?
If you have the Email Assurance subscription, all new data will be analyzed daily and all existing data will be analyzed weekly. This data will be automatically updated in your MailChimp account. Check the date Last Changed to see when the last Email Assurance run occurred.