Every large corp has email filtering and logs. Easily just look for the employees who received the verification email from signing up to Blind w their work email addy bc you gotta use your corpo email address to join and comment there.
I'd be able to look at our logs and find that in just a few min.
Since it seems Spez is such a lil sensitive c-suite sf bro type, he'd be able to get that info no problem.