While Medtronic tends to be rather weasel worded about it, their pumps are also supposed to be waterproof, albeit in very limited way. Their claim is that their pumps have a watertight rating of IXP7, immersion at a depth of 1 meter or ~ 3 feet for 30 minutes, when delivered.
But they seem to be implying that immediately after you open the box all bets are off because you might have damaged the case of the pump in a way that compromised it.
It's not a position that I can see would do them much good, so I'm not sure why they bother post it on their website. But for whatever it's worth, here is the link.
I'm not sure what Medtronic's current effective policy on this is. Once I dropped the pump into the toilet. Of course, it seemed fine afterwards but I called it in to the help desk, probably mostly to see how they would react. They overnighted me a replacement pump "just to be safe".
But I can't remember when that was or which pump it happened with. I think it was some time ago, so I'm not sure if the company which has already cropped the pump warranty coverage from 5 years down to 4 would still be so flexible.