Update, got my chest now finally, the map contained a bridge which deffo looked like it was leading over water, however, the “water” was a kind of path and hardly grey-ish, blue-ish either, so I never checked that specific place.
Loot: 3 dyes, 2k dram, 2 major shards - the dram amount was more decent than Ricknesse’s, at least, but I still think it wouldn’t hurt to mix a potion in AND a couple of rare drops like in the grinder chests! It’s only 1 time per day we get a chest and it would make chests more worthwhile to sell and buy in the auction house also if you can possibly get real valuable and unique things outta them.