I suspect it is a formality, designed more to be enforced in the case of high-risk tenants and I think it's extremely unlikely that the insurance company would ever want to see such reports...but you never know!
Your parents can inspect it themselves or appoint an agent to do it for them - it can be anyone. If there was an inventory when you moved in, they could just check the state of the building itself inc. fixtures and fittings, and ignore all the contents.
'Pause you who read this, and think for a moment of the long chain of iron or gold, of thorns or flowers, that would never have bound you, but for the formation fo the first link on one memorable day'. Charles Dickens, Great Expectations