Confirmed, I just fished it up on the southern shore of Hillsbrad among the murloc camps... second cast into a pool of Floating Wreckage. Was in a watertight trunk,along with some change & a couple bolts of wool :)

I got a book that became soulbound to me from one of these where i learned the skill find fish wich lets you see gatherings of fish and such on the minimap

Fished a few from Hillsbrad.. The small pond right next to Tarren Mill.. One of these boxes contained a [Sentry Cloak]. Later when I went to Orgrimmar, I put it in to AH for 85g bid 89g Buyout. It was instantly bought with buyout.

Now I am even more rich than I used to be: total amount of cash at the moment is 5914 gold. Gathering thousands of golds isnt too hard, the places of farming must be known. Have faith. Fish. Good luck!

Got 4 boxes from Stonetalon Mountains

box 1:
74 copper
forest buckler
4 medium leather

box 2:
1 silver, 65 copper
2 healing potion
2 bolt of woolen cloth
2 bolt of silk cloth
4 medium leather

box 3:
1 silver, 84 copper

box 4:
1 silver, 28 copper
2 lesser mana potion
heavy leather

this is fished out of lots of places, as listed above. got it in an oil spill in stone talon mountains, as well as a floating wreckage in stonetalon and caught this in hillsbrad foothills too one time. (i have fishingbuddy, which keeps track of everything i catch and where)

opened the 3 i got in stonetalon up, loot as follows:

box 1:
1 silver, 53 copper
bolt of woolen cloth x2
bolt of silk cloth

box 2:
1 silver, 36 copper
superior tunic of stamina
healing potion x2
medium leather x7
bolt of woolen cloth

box 3:
1 silver, 56 copper
large red sack
lesser mana potion
medium leather
heavy leather
bolt of woolen cloth
bolt of silk cloth