Excelsior

What is this? I got it from a treasure chest, i got around 1 hour fishing at some swamp in feluca just getting some lurker things, is this worthy? Thanks.

A secret stash note works like fishing but in the swamp. You read the coordinates and than you use uo auto map to find location. Fish in the spot and pull up a treasure chest from swamp.

Fishing up lurkers seems to say your in the correct location.
Maybe your fishing skill is not high enough? Not sure what skill is needed as I was already maxed out when stashes were introduced. Wouldn't be surprised if skill needed related to stash size though - would think 80 at least would be a good guess?