That's a lot of moly and calcium. You could probably figure out what oil was used if you compared the additive package to other known UOAs on here. It's a great looking UOA, showing a healthy engine, fuel, and filtration system.
A TBN would've given you an idea of how long the oil was in service, but based on the wear metals, maybe 5000 miles?
The maintenance light is probably automatically set to go off at certain intervals, and must be manually reset. Check the owner's manual.
Good luck with your new drive! I've always liked Prius's though I've never owned one.