Apple COO Tim Cook was reportedly spotted in the lobby of China Mobile’s corporate headquarters this morning. Citing the Chinese-language Sina microblog of a First Financial Daily reporter, M.I.C. Gadget reports that Cook was walking through the lobby with 7-8 people at roughly 10:00 a.m. local time, and seemed to be “happy.” The report also includes a picture that purportedly shows Cook in the lobby, but as the subject’s face…