No. Do not turn an unresolved result into identification. Read the report's method, question, explanation, and limits.
No. It concerns the specified comparison; broader case involvement is a separate question requiring other evidence.
No. It indicates no result from that examination in the relevant record, not a tested negative finding.
Not by itself. Database search outcomes and a formal sample comparison are different processes with different limits.
Yes. Track each item and examination separately instead of assigning one category to the whole case.