Ok so I took your advice and jackpot! I just had my friend at work drive me around while I was stuck in the back and it turns out the metal latch on the hatch near the tail light that holds the hatch closed was the culprit. I could not locate the sounds at first because of the echoes but I noticed it stopped if I pushed up hard on the hatch glass. We pulled over and popped the hatch and looked around and I noticed that wiggling the hatch latch
made the same noise. I'm going to Home Depot to get a set or Torx wrenches. After removing most of the stuff in the back I'm thinking about doing some sounds deadening myself now.