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.
I have dreamed in my life, dreams that have stayed with me ever after, and changed my ideas; they have gone through and through me, like wine through water, and altered the colour of my mind. Emily Bronte