Please help with Camshaft I.D

[A&S Banshee 00]

I have a 2005 TRX 450r that I bought in Oct 2005 and I'm the 2nd owner of the bike. When I bought it from the guy it was still brand new and completely stock. He bought it and didn't like it. I'm new to 4 stroke world. So I'm getting ready to do its 1st complete rebuild to the engine sense owning it and would like to know if there's a way to tell if it still has the stock camshaft or if it might have the HRC camshaft in it. Are there and marks or numbers to tell you what camshaft it has in it? I have no idea and I tried contacting the guy I bought it from to ask him, but he passed away from a car accident in late 2006. So please help me.

Thanks