For me, every year I got the call...
"we want trade data (for a specific time frame in all cases), journal data, wire transfer data, ACAT data, DTC transfer data, new accounts, reorg data, etc.
Then they say when they were coming in and to have all the data in the conference room and reserve it for two weeks.
This is how firms and brokers get caught and fined, not by you and I calling the SEC. It is a spot check, which is why some get busted and some get away with,
And trust me, pulling all this together from all our departments was a pain in the arse, but the trade data was what they were looking for mostly, the next were new accounts, they wanted to see if there were any bad actors opening new accounts and if we reported them to the FRB. I never worked in New Accounts.