Looking at dead Prius

Chewed up wiring would be the cause and it's probably not a good idea to buy this unless it's used for parts

 

I would walk away, if pressed, I might run away.

You have no idea what is wrong. The Prius is a computer with wheels, there is wiring everywhere.

You will need to replace 3 batteries: Fob $3, 12 volt $180, and HV $2500. They have not been charged in a long time and are dead. (sounds like they already replaced the 12 volt)

You will not find a great deal of Prius experts in AR.

 

How much $$ do they want for it? I wouldn’t give much unless the car is otherwise in immaculate condition, and you own a truck/trailer to easily move it around.
I’ve worked on my fair share of cars with mouse damage, and I’ve yet to see them go after the wiring. They prefer to go after any food crumbs and paper, tissues, napkins, etc left in the car. They also seem to like jute padding or other loose insulation material to build nests. I would try to verify that you have the correct key, then see if you can borrow a known good used battery to test with.

 

Many many reports on this forum of mice wiring damage on a Prius. They really like the wiring.

https://priuschat.com/search/73547574/?q=mice+damage&t=post&o=relevance

And to the OP an 04 that has sat for any length of time will have a dead hybrid battery the big expensive one. In addition to the mouse damage that's probably why it wont start.