Tough call
I have an 09 600 Etec with over 10,000 miles. Starts easy and runs great, I used it as my backup sled on my last UP trip when the primary failed on my 14 800 Etec.
Id make sure its completely cold, start it up and put it into reverse after about 10 seconds of it running. If it stalls out, pass... if it goes right into reverse, maybe offer $3500 and see where it goes from there. If a dealership had their hands on it last season I'm sure they sold him everything they could, might be a good machine