At the moment, all you have is the probation officer’s word for it.
You need it from the beneficiary, preferably in writing, you do need it from the beneficiary themselves. Is there any reason why you shouldn’t write with the disclaimer document asking for it to be signed and returned? You can say in the letter that if this is not returned signed, then you will have to make further attempts to contact which, based upon what you have said, he may not want. All he needs to do therefore is one signature and pop it back in the envelope in the post.
I think it would be very risky to distribute the disclaimed part of the estate unless you actually have it from the beneficiary in person
Can I clarify anything for you?
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We can still exchange emails. Best wishes.