I have seen reference to several fossils of thrinaxodon but I am not sure how complete all of there are. There are a lot of fossils of mammal like reptiles in museum collections and some of them are nearly complete. As I said I have seen some of them myself. You could look at this paper for exampleProve me wrong -- show me this thing, and show me this thing as it matches its drawing.
The Skeleton of a Baurioid Therocephalian Therapsid from the Lower Triassic (Lystrosaurus Zone) of South Africa, by T. S. Kemp Journal of Vertebrate Paleontology © 1986 The Society of Vertebrate Paleontology. which describes a virtually complete skeleton of a therapsid mammal like reptile.
You can't really see the skeleton on specimen shown on the Wiki page

Thrinaxodon - Wikipedia, the free encyclopedia
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