A.T. Robertson Commentary Acts 28:21

"And they said unto him, We neither received letters from Judaea concerning thee, nor did any of the brethren come hither and report or speak any harm of thee." — Acts 28:21 (ASV)

Letters (γραμματα). Official documents from the Sanhedrin about the charges against Paul.

Any harm of thee (τ περ σου πονηρον).

Evil (πονηρον). The three aorists (εδεξαμεθα, απηγγειλεν, ελαλησεν) cover the past. These Jews do not mean to say that they had never heard of Paul. It is hardly likely that they had heard of his appeal to Caesar, "for how could the news have reached Rome before Paul?" (Page).