iaccidentallytwink
Guild Master
Found this unlisted upload I made from the end of Classic Vanilla when I tried to farm a few thousand coffers worth of keys as fast as possible. Not sure how super useful it is, but wanted to post it so it isn't lost to time.
Route works for any class if you have speed/invisibility pots. The ledge is a safe spot, and then you invis to reach the room. I skip the last coffer because there is no consistent way to avoid aggro. 70s could probably grab the last one as well.
Coffers aren't actually useful until TBC (and are BiS until Cata), but I did my farming in Vanilla. I guess clothies would still find it useful at 70.