You did the right thing to insure it, you are not the policyholder on the original, there is a period of grace but the policy doesn't automatically transfer. It may be possible to transfer or amend it, but it would be a different policy and maybe a different premium, for example because it's an empty property. If you found the policy then the estate could probably cancel it and get a refund on the unused portion. Usual caveat of course, that if in doubt get professional advice, I don't think it's anything to be concerned about.