The authority rejected hearing his case and suppressed names.
The agent said he kept his own database and was not secretive about it, showing it to others he worked with at the boss' firm. The 866 entries he made were all of owners he had called in the time he worked there, he told the authority.
But when he went to the rival firm, the boss claimed he continued to use the old company database.
The authority rejected the manager's complaint because the agent's actions did not fall within the definition of real estate work and the agent's explanations were plausible. He did nothing covert: at least three staff assisted him with his own database, it found.
In a written statement to the authority, the agent said he had wanted to stay at the first agency where he did so well and others there had admired his hard work and success.
But he conceded he should not have posted out some data and apologised for that error, wishing he could turn back the clock.
The manager says the agent's sudden exit from the new firm only strengthens the manager's case.