Hi,
According to my research, I'm afraid that there is no such a built-in option in Outlook to check the history of which accounts have been accessed this folder.
We could check who have the permission to access this folder. To find this, please right click the folder and choose Properties. Under permission tab, you could see the list.

If you have more concerns on this feature, it is encouraged to visit the Outlook user voice forum:
https://outlook.uservoice.com/ to vote for a similar idea or post your own.
It is a place for customers to provide feedback about Outlook. What’s more, if an idea is high voted there by other customers, it is promising that Microsoft Product Team will take it
into consideration when designing the next version in the future.
Regards,
Perry
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