Just chiming in as I opened a case of the 002 series. Only some boxes contain a fully transformable valk. Most boxes contain parts for only for one particular pose, be it gerwalk, battroid, or fighter. It sounds like some of yours may indeed be missing pieces, or they could be the variety that are not fully variable.
On a similar topic, I have a question regarding K&M series 002. I opened a case of 10 boxes and 2 of the boxes had a sealed black bag with Japapense writing on them along with a figure. The bags contained what appears to be scrap parts in odd colors. Some parts look like heads and other components of a valk, while still most of the others seem to be just scrap crumbled pieces of plastic. One of the bags was included with an armored vf-1j and another was with a red vf-1j fighter. None of the other boxes had this bag of scrap parts.
What is this all about?