Usually, OSHA only responds to lost time occurances rates or direct complaints claiming unsafe practices. If you have OSHA in your facility you already reported the data which brought them to your doorstep. There should be no surprises unless your managers were playing dangerous games.
I’ve worked here just shy of three years, and as I understand it, the last time our facility had a thorough inspection was 18 years ago. This stuff is above my pay grade, but everyone certainly seemed surprised to see the man from OSHA.