Hi Walter,
The reason that you seen only 106 workflow jobs in the "Execution Status" window is due to the "Client Preferences" configuration to display the maximum number of rows for Workflow Execution.
This can be configured from : Administration > Client Preferences > Max number of rows to display > Workflow Execution.
So the workflow execution job list is not actually "stripped", but just "not displayed".
The "maximum workflow job executions to keep" configuration enables you to specify the maximum number of recent workflow execution records to be kept in the database. Workflow execution records beyond this configured number will be purged on a periodic basis.
Currently, WFA can be configured to retain workflow execution history based only on the number of workflow executions using the above configuration parameter (Minimum -200 and Maximum - 500000). there currently is no support for retention by date/period. I will take this as an enhancement request.
Finally, the following link provides multiple approaches to export workflow execution related logs following which relevant information maybe extracted : Export Execution Logs.
Hope this helps,
Tanzim