Apparently somewhere between June of last year and today they broke loc export. Sorry.

Edit:
Ok i just tested it. loading a single loc files take a the same amount of time to load as 100 cache GPX file. Trying to load a set of 90 loc caches was about crashing the n810. Do the export with maemo mapper off to save cpu power and the export will auto launch Maemo Mapper. I will try to load a multi cache loc file later.

Edit 2:
If you create a loc file with 20 caches in it (i will go throuth how to further down) it loads really fast.

Create large count loc files:
1. go to the page with the caches in your area.
2. scroll down to the bottom part of the page
3. click 'check all' then click 'download waypoints'
4. Load like i described (treat as a file)
5. have fun Hopefully