SQL Server Inventory Verification Process?

Upon joining the company, I discovered that the previous administrator had meticulously documented our server infrastructure, albeit with numerous inaccuracies, particularly in relation to several SQL database migrations between servers. Given my limited experience in database administration, I find myself needing to conduct a comprehensive re-inventory of our five Microsoft SQL servers. To accomplish this, I've resorted to logging into each server using SSMS and the SA credentials to assess all databases. However, my uncertainty arises from the discrepancies between the documentation and my findings, and I'm keen to koows ensure a thorough approach without overlooking any critical components as I proceed with future adjustments. Your insights on this matter would be greatly appreciated.