Hmmm... 2:00am, Neptune's Glaive, couple Diamonds and Fire Quartz, fingers full up with expensive Rings. Small Backpack full of aromatic Fish announcing your presence to anyone with a nose from 50 meters away. Not enough energy left to fight off even a small frog.
And no Return Sceptre.
But only 3 g. Just how is Dr. Harvey supposed to stay in business if he can't fleece you for an honest 10% and still pay the rent on Maru's nurse cap?
Well, at least it wasn't in the Mines, so you had enough time to stuff the Glaive, Rings and Diamonds into the stinkiest no-star Bullheads at the bottom of your pack so no random passers-by (who might be named Marlon...) happen to alleviate your burden and then charge you the next day for the ambiguous "service" of storing finding it for you. And he'd never 'find' the Iridium Carp which just happen to end up in his Koi pond.
Total coincidence, there.