You need to be more specific. Are you saying the files are shown listed in the device's GPX folder, but no caches show when you tell the GPSr to display caches? Or are you using "Send To GPS" which is not working so well lately, so the files are not arriving at all?
To be clear, you are loading them manually into the GARMIN/GPX folder, right? Using a file manager? If not, do that. If so:
1) Caches beyond about 100 miles from the GPSr's location will not automatically be displayed.
2) Check to be sure the caches are not out of view due to some selected filters.
The caches aren't found in the device's GPX folder. All of the caches I'm trying to load into the device are within 40 miles of my home cords.