If the updates are on the timeline, you maybe able to use the table - h_buz_activities to narrow down your search parameters, you will need to use a SQL Scheme Designer report option. IF you want certain fields, you may have to link the table to other tables but the majority of what you may need is in this table.
I joined the table with the Requests table
You may be able to do other methods but this is what I used to narrow down who was assigning requests to a certain team.