'Record(s)' of 'documents' is odd because record = document, and also both are odd because 'records' is in the question, so the word would not naturally be repeated by the 2nd speaker. Otherwise, either will work.
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anonymous Hi. Please help me with this. What would be the difference if there were any?
(talking/in conversation)
A: Have you found the records of his documents in our file?
B: No, sir. There was no record/were no records of his documents in our file.
There were no chairs in the empty room