Bongoman is correct - they don’t immediately have access but if they suspect that there may be something amiss they will request access and check - that’s mostly how people get caught. The lawyer I spoke to said the exact same thing. I submitted an LOE admitting to the misrepresentation and then requested a TRP so I could overcome that admissibility so it wouldn’t affect any future applications where I might have to submit those payslips and the like.