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 lists cleaned by DataValidation to see an Email Assurance Grade and the date Last Changed.