Okay, after reading and going over the files, from what I can tell, the point of the asset tokens having a face-up side and a face-down side is just to conceal the information on them (which network they belong to and how difficult they are to recruit) until someone reveals them. So while I was probably planning to do a decorative back for the asset tokens, they would effectively be devoid of information and blank token backs would work as well.
It is an oversight on my part though, as is the missing USSR flag tokens. I'll make a new file for the token sheet and update the files here and I'll send the new token files to you as well.
Sorry for the inconvenience!