Ryan-
(That's my name too!)
I can't tell you enough how much I share the love of TMNT like you. It truly is a sheer stroke of luck to come across anything from the Ninja Turtles series. I still remember back before the internet existed (as a mass society community of sharing information) that when my friend and I first laid eyes on the Secret of the Ooze poster we were talking about who the two shadowy villains were in the background HOPING it was Bebop and Rocksteady (We loved the 80's toon series version). We weren't too disappointed to see Tokka and Rahzar and TMNT 2 was our favorite of the 3, even though #1 was totally bad***.
Going back to your post though I can;t tell you how awesome it is that you have a piece of the man himself, the Shred Dude! You've probably seen my Foot Soldier screen-used mask I posted on the forums which remains one of my absolute favorite pieces ever. I can't screen match it because it's impossible trying to spot one mask from another in differences. They all appear to be the same. Some oddly though look like they have wire mesh while others a bit thicker in eye materials. But could also we the way the camera shot that. Stuff on camera looks different in person when you see the imperfections, but that's what makes these pieces so cool.
I obtained my Foot Soldier mask through Propstore.com and though it was very expensive it was a no brainer that I had to have it. It trumps any vintage TMNT toy I own by far.
SUPER congrats on that shoulder blade. THAT is some rare stuff!