my thoughts are this,its eight years old and never been run?
I would have the dealer pull the spark plugs and look for any rust in the cylinder bores,especially if it wasnt stored in a heated building all of this time,if there is any rust in there,chances are that the crankshaft and bearings are rusty also.
reason being,condensation from temp extremes can rust anything,inside or out of the motor,electrical connections can be corroded also.
I am not trying to scare you off with this,but there is the real chance that this can happen to it.
if it has been a heated/air conditioned building for the last eight years,chances are its fine,would still haggle with them on the price though.
low ball them at 2600 and you can come up from there,but thats me.