Thank you all! I've recieved the records letter (last phone uploaded to the imgur link below). I also had someone tell me that it was common for folks to send their guns back to Parker to have 28.5 inch barrels fitted to them, which would explain the barrel lenght and matching serial numbers. The numbers all match, including even one set located on the inside of the steal buttplate.
I don't plan to hunt with it, or probably even shoot it because it looks so good!
http://imgur.com/a/fQVIN