It's taken me a bit longer to complete than expected, but I finally have a web page published for a census of the 1892-1893 revenue-stamped supreme court documents of Nicaragua's Mosquito Reservation.
The reported population is still very small, comprising a total of 22 documents. Despite their scarcity, they don't appear to be incredibly expensive ($75-300 each for the most part). The stamps are also unlisted in any of the major stamp catalogues, so most auction houses are unlikely to lot these individually... thus my finding no imaged examples appearing in any online English-language auction archives.
My hope is that there are more out there that can be reported and included.
Corrections, improvements and additional examples appreciated.https://revenue-collector.com/mosquito/