The grant of probate, the estate inventory and the executor's final accounting or statement of distribution, followed by the records showing how the deceased acquired the assets. Bank statements then link the distribution to Adaeze's own account.
Ask the executor before the estate file is closed and archived
Timing drives this list. Estate files are wound up and stored, executors move on, and a lawyer who administered the estate two years ago will produce records faster than one asked five years later. Start with the grant of probate or its provincial equivalent, which establishes the executor's authority and identifies the estate.
Take the inventory of assets, which shows what the estate held. Take the final accounting, which shows every payment out, including tax and administration costs, and identifies Adaeze's share. Then work backwards into the aunt's own records for each significant asset.
Where something is genuinely unobtainable, secondary evidence helps: land registry abstracts, confirmations from a financial institution, the estate lawyer's file. Any document not in English requires a complete certified translation. Gaps identified now are manageable; gaps discovered during adjudication are not.