If its a cheap/project bass then it does not matter anyway.
If its a more valuable bass then buyers need to see things like
- neck date/type stamps,
- body date stamps,
- neck pocket finish showing original maskings,
- preamp or pot date markings and original solder joints,
- rear of the pickguard may show originality and usually hide any 'extra' pickup routes often hacked out!
Different basses have different little quirks that clued up buyers will ask for too so in many cases it is a must, I certainly would not buy a vintage bass without seeing the rear of pickup and the control cavity.