Which preposition to use with trustworthiness

of Occurrences 19%

He made inquiries about the place where the gold was found, and subsequent inquiries about the trustworthiness of Mr. Bennett, and on March 7th he was at the mill.

at Occurrences 1%

In the evening I had a visit from the son of a very remarkable man, who had been one of the chief drivers on the estate in Major 's time, and his son brought me a silver cup which Major had given his father as a testimonial of approbation, with an inscription on it recording his fidelity and trustworthiness at the time of the invasion of the coast of Georgia by the English troops.

Which preposition to use with  trustworthiness