I had to do something similar for a background check. I didn't see anything in Revenue online at the time, but looking now when I log in under Tax Services, PAYE services there is an option for Employment Detail Summary. This lists start and end dates and company details, insured weeks etc. It only goes back to 2019 for me. But when I go into my tax credits that goes back 16 years. Hope that is helpful. The PRSI statement won't show any employer details. But if needed possibly contact Revenue via My Enquiries and they may issue your friend a statement across all years.