Batts are 5 years old….replace
Troller may be ok depending on what kind of fishing you do. I had a 12V-55 lb on my C-liner 1750 which was “ok” for fishing lakes in a very gently breeze or less. If you plan on fishing current or bigger water, upgrade to 24V.
Locator….again, depending on what kind of fishing you do, a lot of guys get by with something like that. This is a great time to upgrade to a 5″ GPS/sonar combo, like a Lowrance 500 series unit. Lots of them on closeout shelves these days with the new HDS units being rolled out.
Judge the condition of the cover your yourself. If it’s been stored outside for 4-5 years, it’s ready to be replaced. On my C-liner, the factory snap cover was getting pretty worn after 3 yrs. This boat is 1-2 years older. It may be time to replace the cover.
The prop is irrelevant, since you won’t be using that 40.
Check the condition of the lights, bilge pump, livewell pump, fuse block, carpet, seats. Ask when he last repacked/replaced the trailer bearings. What about the trailer tires and the trailer lighting system? Dealing with any of these issues will cost $$.
My advice: 6000-6500 may be reasonable, based on the checks above. Get the boat, replace the motor, add an on-board charger, do a couple of upgrades and replace the things that are worn, and you’ll have a nice, versatile boat that will keep you in fish for years to come. If you need a recommendation for a guy to deal with the upgrades/repairs for you, drop me a PM.