I did do a file transfer from the Garmin over to my computer and then opened the file with Mapsource. It showed the caches but not as found. It should have shown the found caches as a open treasure box. So I'm not sure what I am doing wrong.
You are not doing anything wrong. The CO does not work like other GPS units. It does not change the icons. It marks the cache found in the Geocache application and adds an entry to geocachevisits.txt file
So how will I know which caches I have found when I look at Mapsource? There has to be someway to show the found caches.