Hello @sampo1
From my understanding, AEP does not keep a historical record of those sample jobs used in the estimator tool.
Here is some information I found regarding the sample jobs:
Audience estimates are generated by using a sample size of that day’s sample data. If there are less than 1 million entities in your Profile store, the full data set is used; for between 1 and 20 million entities, 1 million entities are used; and for over 20 million entities, 5% of the total entities are used.
Additionally, this estimate is based off of when the last profile sample job was run. This means that if you’re using a relative date function such as “Today” or “This week”, the estimate will base its calculations off of the last profile sample job run time. For example, if today is January 24th and the last profile sample job ran on January 22nd, the “Yesterday” relative date function will be based off of January 21st, and not January 23rd.
Docs