The value used per IRS standards should be the fair market value at death. The executor of the estate can also value at an alternate valuation date.
I am attaching a link from the IRS website.
https://www.irs.gov/faqs/interest-dividends-other-types-of-income/gifts-inheritances/gifts-inheritan...
I hope it helps, please let us know if you have any additional questions.
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