Forty odd years and never got checked once! Lucky me, some poor so and so probably got done a dozen times in lieu!
When a thorough ramp check takes place the word gets around the company fast and it is an opportunity for everyone to make sure all their documentation and amendments are up to date. No harm done.
Friend used to be an inspector, if a licence was wrong, medical out of date then the crew would be affected, otherwise everything else wrong would be taken up with the company.