Do you have the name of the solicitor connected to this? If so I would bypass the uncle, contact the solicitor and tell him what you have just told us.
Reason being, a close relative to me died last year. One of the beneficiaries of their will named, was untraceable via the official channels (He didn't want to be in contact with family), but I , as a distant relative to him knew his last address.
I then did exactly what I've said in paragraph one, gave the address to the solicitor dealing with the estate and he asked me that, if they couldn't contact him via this last known address, would I be willing to hold the funds for him. It would all be set up legally, and It would be official that I, or any other beneficiaries wouldn't have a claim to it.
So would this be something you could look into op, as like me, it would safeguard you from any wrongful accusations.
And, FWIW, the missing relative was found and received his inheritance.