I have found 99% of all treasure chests according to the old man at gyshal. Obviously, I want to find 100%. I did my best to open all chests in areas you cannot return to after defeating the boss. Can anyone suggest a strategy? Can anyone refer me to commonly missed or difficult to find chests? Any and all help would be greatly appreciated...thx in advance...

I don't know if there are actually chests there, having never actually played them, but aren't there bonus dungeons for using the Mognet? If you haven't gone through those, there might be something there.

here's my strategy: action replay.

There is medication for OCD. I should get some, too.

Let's make a pact to go see therapists <3

argh...thanx for the advice slavka and fleed
and yes i do think i have ocd
anyone else have any suggestions?

i took an extended FF vacation but recently picked up my DS once again
took me awhile but I found the chests I needed, 100% yaaaay
they were in a small square seemingly doorless room in the western most castle on the floating continent, in the room where the king sits with his buddies... :)