I remember that my wallet was always way too thick when I was at USTDC because I carried all of my American ID stuff, along with a Chinese ID and Chinese drivers license as well. It seems to me that there was at least one other document, but I don't know what it was. Add to that all of the New Taiwan dollar (NT) notes (at a 40 to 1 ratio in those days, vs. 30 to 1 today), and it made for a cumbersome carry.
Sarj bloom sent me a photo of his Chinese drivers license and ID card, which are shown here. I think by the time I arrived at TDC in 1973, my Chinese drivers license was just a single card, not the several pages that make up this one.