Explain that you don’t have these kinds of records and weren’t required to keep them.
Create a document to reflect what your child learned during the homeschool years.
Show scores from any standardized tests your child may have taken.
It helps to remember that the school generally wants this information in order to determine grade placement. Again, this may not always be in agreement with where you think your child should be placed, but it is often at least a good faith effort at getting your child in the right grade in school.
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References: https://www.thehomeschoolmom.com/going-homeschooling-public-school/

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