Department of Conservation (DoC) biodiversity ranger Mithuna Sothieson said it had been a surprise to learn the seal had returned.
"We had hoped he had departed for waters further south," Sothieson said. "I would say, judging by the length of time he has been absent for, he has left and returned as opposed to have been hiding somewhere close by.
"Who knows what he has been up though," she laughed. "Looking at the photos [taken of the seal during the weekend] it appears he may have grown some hair, he definitely looks a little different from when he was last here."
Not seen since Saturday, Sothieson said he had possibly taken off again.
"If he does return, we ask people to give him space - a minimum of 20m - keep dogs tied up around him and not try and feed him. He's a wild animal and doing what he pleases at the moment, people need to not forget that."
She said DoC would only intervene with cordons if they felt it was necessary.