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I think I answered your previous question.
You can give them the date, what I meant by not revealing details of the Will is that you are not under an obligation to volunteer any of the legacies or beneficiaries.
To satisfy yourself of the validity of the Will you can call local solicitors but you may also consider advertising in the Law Gazettes's Wills and whereabouts sections. Almost all firms will read this section:-
You may also choose to speak to those persons who you think your aunty may have spoken to about her Will.