What are you talking about? No fuss, no muss. The seller will cover shipping fees. Reverb will facilitate everything smoothly if he contacts them promptly.
I don't buy that he's going to straighten that neck satisfactorily. It's obviously been poorly cared for - stored for a long time with strings under tension. Who knows what else? I've reshaped a neck, but not on something supposedly perfect. The pots aren't just scratchy but sound like they were damaged on install by too much heat.
If he starts mucking with it or passes his window, he's an owner, for better or worse, unless green lighted by Reverb.
How many times has this bass been flipped?