James Rylands, director of Summers Place Auctions, said the stones were "a real piece of history".
The court heard that contemporaneous notes by the officer suggested Mr Rylands had not invited him.
The etchings were found during a two-year-long search of the University of Manchester's John Rylands Library.
Mr Rylands said he was "astounded" to receive a noise abatement order "in the post, with no visits".
An expert from the John Rylands Library confirmed the authenticity of both documents.
Mr Rylands said if he moved the coops behind some nearby barns he would moving the animals "towards another neighbour".
During cross examination of his evidence, it was put to Mr Rylands that he had plenty of reasons to annoy Mr Morgan.
Magistrates have heard of a history of incidents between the Rylands and their neighbour Roger Morgan, 48, who complained about the cockerels.
Mr Thomas will work closely with the Bishop of Shrewsbury, Mark Rylands.
Roy Rylands and his wife Valerie, from Bwlch y Fridd, Newtown, are appealing against a noise abatement notice issued by Powys County Council.
The court also heard previously from witness Janet Taylor who described Mr and Mrs Rylands as "the best neighbours I could wish to have".
Jonathan Salmon, for Powys council, said Mr Rylands had offered "one excuse after another" when asked why he could not move the birds to another location.
In telling the story, he suggests that two prominent members of the English community in Venice, Philip Rylands, the director of the Peggy Guggenheim collection, and his wife Jane, might have acted against Rudge's best interests, and that they have been secretive.
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