Since Codebeamer 9.5, there is also a history of all ReqIF exports out of a project, grouped by destination:

Project > Admin > Settings > General > Export > ReqIF destinations…

Clicking on a specific destination, shows the export history to that destination:

To view the statistics and the settings used for a specific export:

The export statistics show the numbers of exported tracker items per tracker.

If also deleted tracker items were exported, their numbers are shown in a separate column.