"The limed-over skeleton of the abbot is in the pool of water... If the remains are disturbed in any way, a cylindrical object will be noticed, the thing being dislodged from where it lay by the skeleton, and the current of the stream carrying it south at 6" speed. To retrieve it, a character must be in the stream and score "to hit" as if it were AC 4 in order to catch it. It is a watertight ivory tube with a bone map of the whole level inside."Moathouse:
"in the water on a ledge is a platinum pin set with a ruby (2,000 g.p. value) and a bone tube. The pin is under a skull (human) and the the tube under some bones. Unless searchers use their hands, their is a 50% chance that either or both treasures will slip off the ledge and be lost below. The tube is water-tight and contains a scroll of magic user spells (push, stinking cloud, fly)"
Sure, one's an MU scroll and one's a map, but c'mon, two watertight scroll tubes hidden amidst bones with a chance of dislodging and losing said item to the PC's eternal dismay?! It should be noted that in monastery, the moving scroll tube has only about 10-20' of stream to go before it flows through the outlet tunnel at the south end of the room and is lost forever.
Also of note: the ruby pin under the human skull, though much more valuable, is somewhat reminiscent of the garnet in the goblin skull in room 1 of the Sample Dungeon. Red gemstones hidden in skulls; what would Freud say about that?
To be sure, this is not jaw-dropping evidence that these two dungeons are derived from a similar progenitor. But, given the vast amount of other forensic evidence, it certainly enhances the argument.