Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
That is the file Outlook is using by default. The file date-time properties should confirm this. If Outlook is currently closed then the file date-time will be when you last closed Outlook. If Outlook is currently open then it will show a date-time for when Outlook last changed anything - for example, it is 19:56 and my pst file was last modified at 19:51 by Outlook as it is currently running.
If you can see that Outlook is indeed using that file & if looking around the various Outlook views shows you that it has everything you expect then there is no problem.
If you can see that Outlook is indeed using that file but it does not contain the things it had before you repaired your PC then you will need to search for another pst file in your backups & in the various folders that you reported having copied/moved around. If there is no earlier pst file in your backups or those copied/moved folders then you have lost that earlier information completely.