True Howard, but I have just found this recent notification (17Dec 2010) which clarifies Appendix III implementation
http://www.cites.org/eng/notif/2010/E042.pdf:
"Implementation of the listing of species in Appendix III where only specified national populations are included"
It seems a little contradictory at times in the notification but I believe the underlying intent is clearly indicated in the last point (Para 9) as to the desired future actions.
However, I still remain unenlightened as to any specific restrictions on any Cocobolo that does not originate from Guatemala. The only issue may be that the onus may be on the exporter/importer to prove that the Cocobolo did not originate from Guatemala which would be difficult. The 2010 notification states that if it did not then no restrictions apply, but how would one prove it to customs officers ......
To be safe, I may have to decide on another back and sides wood for my Bashkin ......