The male captain had returned from a training session with a female first officer on the night of July 20, both publications said.
The technician was told to remain silent after reporting the discovery to a supervisor, they added.
West Wu Wai-hung, controller of the Government Flying Service, told the Post he had received no complaints over the incident, but stressed the organisation expected its staff to conduct themselves according to a “very high standard”.
He had immediately met those involved to get a better understanding of the situation, he added.
“There was no evidence to prove that any illegal, improper behaviours that affect aviation safety had occurred. The incident was caused by the gross negligence of the captain when handling his personal belongings,” Wu said.
The controller said the service had managed the situation according to procedure as the matter could cause misunderstandings and affect the flying squad’s professional reputation.
The crew member involved was issued an advisory letter and received a verbal reprimand, which warned against behaving in any way that undermined the flying squad’s reputation, he said.
Wu added that an internal circular was sent out to all aircrew, reminding them to carefully check all personal belongings and devices brought on board and ensure they were relevant to the flight operation.