I have heard of the mysterious whiteswan walleye, but the problem is, most guys are claiming they find them inside a pikes belly. What they are likely seeing is small perch that have been digested enough to have their skin taken off, etc.. They are just seeing the spiny top fin and assuming its a walleye.
Heard a rumor of a family that traps in the area that knows where to find big walleye, but I'm calling BS! I'm there all summer and I would hear of walleye coming out of there. Loads of little pike everywhere, never really got anything over 10 lbs out of those lakes other than Lakers though.