You can quickly view which Full User bulk edited inventory by clicking on the 'Recent Bulk Edit History' icon between 'Manage Layout' and the Settings gear symbol. This is also where you will see the status of any completed or in-progress bulk edits.

From there, click 'View Full Bulk Edit History' to see the date, time, and who bulk edited inventory. You can then click on a user's name to see which items were edited.