"I knew Carl for about 20 years. When he passed away his sister gave me these things. A lot of them are just photocopies but there are letters people had sent him, notebooks, all sorts of things.
"You could say it's the biggest Goldie collection in the world."
Among the items is a pencil sketch Goldie/Sim did of Peter shortly before the artist died in an Auckland rest home, he said.
There are also letters Goldie sent to himself, dated 7/7/1977, 8/8/88 and 9/9/99: "Just so he could have those special dates stamped on the envelope."
During his lifetime Goldie made money from selling his own original work and also from his "copies" of masterpieces, including one he allegedly sold for $350,000.
It was part of the myth about Goldie/Sim that he was always broke, Peter said.
"He used to have race horses. He gambled. He had plenty money come and go in his time."
Peter said if he doesn't get a good price when next he tries to sell Goldie's belongings, "I may as well keep them".
"Art dealers didn't like Carl and won't touch his stuff, but he was a New Zealand icon in the art world and a real character," he said of his old mate. "This stuff is priceless to the right collector."