I recently visited the FBI Museum/Tour at the FBI HQ in DC. There's a section where they talk about tech the FBI had in the 80s, including a camera they used for an undercover operation where they recorded some illegal shit going on in a hotel room.

You walk into a mock hotel room and even knowing the general vicinity of where the camera should be, struggle to find it. I flat out couldn't until a friend who works at the FBI told me - it was in the period on the artists signature of a piece of artwork in the room. A literal pinhole camera recording everything in the room more than 3 decades ago with pretty great quality.

I can't even fathom the technology they have today - there's no chance that'd be on the tour.