I found a chest in front of the CP/Uru gate on the CP side. That was fun.

You could try:

Cruising through Sea of Greed
Cruising through Luminous Stone II
Cruising through Concealed Peak

Those are the places I found them at 40~49

iKoali found one in CP1 right next to the Ratmen Knights while she was questing :D

hmmmm thanx but most of those places i dont go any more == i only stay at uruga and other high lvl places >.>

and i noe aew has the most but.... ill get killed while im trying to open it ==

I think pets tend to be in lower-levelled maps.

I know LS2 is popular but I have never found one there because it is so popular.

for pets I always went to Sand Hill

well.... im trying to find a chest with gold lumps in it ==

Theres one in the sea of tides in Epith but its in an unreachable area so I couldnt get it ....T_T

>.> i still haven't find a treasure chest =.=