At least three more official Kenyan documents from the same time period need to be published showing the national identification Republic of Kenya. That should not be difficult to accomplish. They could be forms from any govt ministry a long as they were cotemporaneous to Feb 1964.
This site dated 10/12/03 talks about the Peoples Republic of China and Republic of Kenya with a date of December 14, 1963. So, here is number 1
http://www.chineseembassy.org/eng/wjb/zzjg/fzs/gjlb/3014/
A. Review of bilateral political relations
The People’s Republic of Chinaestablished the diplomatic relations with the Republicof Kenyaon the day of December 14, 1963. In the initial days of the establishment the relations between the two countries it saw a fair development.