If an account is deleted in Partner Center, there is, unfortunately, not much you can recover anymore, however, you can identify the deletion information for the respective account group IDs (AGIDs).
For that, go to PC > Administration > My Billing > Estimated Usage.
The limitation is this option can be obtained only for the current month. So you can click on the Blue link for the month to get the CSV download.
You can filter by the column by using the control F to navigate to "Deletion Date" as non-blank and find a list. Once you arrange the columns as per your need, you might find the information you are looking for.