Used Prius. General questions and infos about nav/screen

Hey all

I'm in the market for a used gen 3 prius. I've found one with 80'000 miles with a decent price. However, the car has no navigation/screen.

First of all, are there a few things i need to check out while taking it for a test drive? The car is being sold by a private seller, and i'd like to avoid getting a fraud if i can (who doesn't).

Now, something i'm unsure about:

What exactly are all the options/trims? Since it has no screen, this one will not have the backup camera, and therefor i'm assuming it won't have the automated parking system etc. (not really interested in that, altho it looked cool).
Generally speaking, what am i missing out when i go with a model that has no nav/screen.
I'm planing to get an android radio anyway, so if the things i'm missing out are just the camera, then that's good, since these models have a lower market price.

Thanks in advance for the help