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There is actually a way:
1. Go to Top Elevation Caches.
2. Put your username in 'Profile Name'
3. Select the 'hide owned/found/not found' filter.
4. tick the 'owned' and 'not found' boxes in the 'hide' filter.
5. Click 'filter'.
This will show you a list of all the caches you've found, sorted by elevation.
The third alternative is to use the Grease monkey script to check the elevations of them. But it would require looking at all of your finds.