I purchased them from the guy who was there as a kid and he had saved them in a draw since. From there my friend Donovan Ritter (80s Haro Rider) helped me get the Haro book signed by most of the riders in the book, he sent it all over America to the riders and as you can see in the video he met DMC who signed it.
From then on I have contacted other riders to get powers etc signed and also purchased signed items from eBay or other guys in the scene.