I don't know much about Uncle Sam but this body does look to be a Triad Toys EVA/EVO or a mix of a couple of different parts.
SPECUALTION:
Triad ALPHA Ankle cups....Those are the correct parts for th body. I don't know why they would be cracked and burnt unless they tried putting a different foot on the post and decided to heat up the post instead of the foot they were using.
Triad ALPHA/EVA/EVO neck...It seems like they used another manufacturer's neck post and heated it to make it work. Triad uses a smaller neckpost thus...this is why you have an attempt to put a bigger/melted neck post in a smaller opening-CRACK..CRACK..CRACK.
Triad ALPHA hand but wait....that is not the stock wrist pin for it....By
looking at the picture, it is an ALPHA hand but the wrist pin looks like a stock Takara/TTL/CG generic wrist pin which rotates in two directions. A Triad ALPHA wrist pin rotates via a double ball joint and NOT a hinged type of wrist pin. Most of you know what I mean.
In closing....I think you should contact the person. Second, be sure you received what you were supposed to receive. Did you purchase a mix of parts or a stock body?
NOTE:
Whoever is responsible for this dispicable and diabolical act to this body, NEVER USE A FLAME OR HEATGUN ON PLASTIC! ! ! A BIT OF BOILING WATER OR EVEN A COUPLE SWIPES WITH A HAIRDRYER WORKS WONDERS....
SMcG