Why don't you ask him if you can shoot it? It sounds like a good deal to me with 2 doz arrows if they're carbon they'd probably be around 3 to 5 bucks a piece and the release is thrown in as well.
You said it was loaded what's it got on it for a quiver, rest and sight? Look at that and figure the cost of that as well. It doesn't sound like you can get hurt on the deal at all.
I picked up a used martin jaguar last year an 04 model from a freind that came with everything.Hard Case, soft case, block target, quiver, release, 20 arrows 5 with broadheads and 6 field tips for a heck of a price. Mine had a drop zone rest and a single pin truglo sight that if purchased new alone would be what I paid for everything.
I like the bow a lot. It's not the fastest bow around but it suits me just fine.