Hi,
The first two pics appear to be the remains of a drive shaft center support. Take a look at pic 1. I found a pic of a new one. The part would have had a rubber mount in it and a bearing and be mounted to the body of the truck and the center of the rear drive shaft would have gone through it.
The last pics appear to be a skid plate. That one could go under the engine oil pan, transmission, transfer case, differential, and even the fuel tank. I can't pinpoint it because I don't know how big it really is. However, the large oval on it indicates it was likely a place to drain oil or fluid. I honestly feel it is to protect the transfer case. I attached a pic showing the transfer case skid plate. I feel this is the same as what you have.
Let me know.
Joe
See pics below.
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Sunday, September 12th, 2021 AT 9:04 PM