Thanks. I already had posted it on RailCritters. Jay Reed was kind enough to supply some information on s/n 31146. It now appaears that there were two different #56 units at Chiriqui Land Co/Bocas Fruit Co.
s/n 31143 was the first #56, renumbered #803. This was the first of this model built.
s/n 31146 was built as Granada Co. #6 (Dominican Republic) per Jay Reed. This confirms the story that the first two orders were for Panama and the Dominican Republic. I still don't know how many of the second order were built, how or when it ended up at CLC/BFC, or anything about the third order.
Both s/n 31143 and 31146 were scrapped about July or August of 2007.