In the System Admininstrator utility, please go to "Corporate Settings >> Queries >> New" and use the following query:

SELECT * FROM AIT$AUDIT WHERE AUD_ACTION = 2;

This will show the timestamps of all record deletion actions (AUD_DATETIME), and the users that performed them (AUD_USER_NAME and AUD_USER_REAL_NAME).

Unfortunately, there is no way to see which action corresponds to which record.