You mentioned you did find the form filled out with years of history. If this the case, Turbo Tax has a record of it that is stored if I understand your statement correctly.
The reason it wasn't in your list of forms to be filed with the IRS is because you did not have an AMT reporting requirement this year. Whenever there is a AMT reporting requirement though, Turbo Tax will have a record of all of the carryovers that have occurred. I would suggest either printing this Schedule B AMT or keep as a PDF to keep with your tax return each and every year you carryforward the credit for your own reference.
@turbokarst
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