This is another case where the Tax Act of 2017, TCJA, effective for 2018, eliminated the tax deductibility of casualty losses such as the theft you mention.
This deduction used to cover a pretty wide-ranging set of circumstances, but that changed with the passage of the Tax Cuts and Jobs Act (TCJA) in December 2017. Beginning with tax year 2018 and through tax year 2025, you can only deduct casualty and theft losses if they're brought about due to an event that's been declared a disaster by the U.S. president.
You can still claim these losses on your 2017 Trust tax return, however, if you amend it—even without a presidential declaration. So if the theft occurred in 2015-2017, you can file an amended return to reduce tax paid that year of theft [2015 if ame'nded before 4/15/2017].
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