If my drive isn't clicked into place, it's in my hand. When I land, after I hop out, I pull it, and it stays in my hand as I pull the yak onto the beach.
For those that have a process that leaves the drive unattended, and not locked in- I would definately be leashing it.
I personally wont ever leave the drive in while I bring the yak on the sand. I can't stand how it sounds/ performs after all that sand gets packed into the chains/ rollers/ hubs..

Only did that once.. never again.
Hope the OP's drive shows up. I didn't see anything this afternoon. Will keep an eye out tomorrow.