No, you need the fair market value information to compute your loss.
According to Figuring a Loss in the IRS’ 2021 Publication 547,
To determine your deduction for a casualty or theft loss, you must first figure your loss.
Amount of loss. Figure the amount of your loss using the following steps.
1. Determine your adjusted basis in the property before the casualty or theft.
2. Determine the decrease in fair market value (FMV) of the property as a result of the casualty or theft.
3. From the smaller of the amounts you determined in (1) and (2), subtract any insurance or other reimbursement you received or expect to receive.
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