Unfortunately, a letter from the charity may not meet the IRS guidelines, unless a qualified appraiser provided the value quoted in the letter.
According to IRS
Pub 561, if
you claim a deduction for a contribution of noncash property worth more than
$5,000, you will need a qualified appraisal of the noncash property and must
fill out Form 8283, Section B. Generally, you do not need to attach the
qualified appraisal itself, but you should keep a copy as long as it may be
relevant under the tax law.
There are some exceptions to this requirement, but cemetery lots are not on the list.
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