A couple of notes that might help:
0> The file you're looking for might be in: /home/user_name/.adobe/Flash_Player/AssetCache/ or
/home/username/.macromedia/Flash_Player/Logs/
1> There might be a low-level way to see if an RSL was loaded via the cache. However, generally, the behavior is simply left to the player (cough) to do the right thing (cough). If the RSL is in the cache - it should do the deal (cough). --- FYI: Here's a decent write up.
Hope this helps.
**>Random FYI> There have been issues (though not related to your question) about RSL's and Linux ... One such bug here. Do be careful (I've been bit by this)