"If you saw anything please let him or police know and if the heartless person is reading this, bring his belongings back."
Colin, the busker, wrote a note explaining that this is not the first time his gear has been stolen.
Wellingtonians are outraged that anyone would do this.
"That's honestly heartbreaking. I hope that those disgusting bastards get what's coming to them," one person commented.
"OMG I remember this sweetheart. He sang 'Twinkle Twinkle' for me one time," another person said.
"Colin is the man, he doesn't deserve this," someone else replied.
"OMG I'm nearly in tears. What a beautiful man with a heart of gold, and what disgusting behaviour from a few members of the public," another person said.
A Givealittle page has been set up to fundraise for new busking equipment for Colin.
Police say they have not received any reports of the incident.