First I would absolutely message John East, he is very helpful
Second I would be a little annoyed if I bought a decent bass to find that the electrics had been bodged as appears to be the case, but.....
It might not have been the seller who did this, on which basis the seller might be completely unaware of it. I'm one of those people who but a bass and within days pretty much take it apart to check it all over, but lots of people aren't, quite reasonably they just play it, and it it plays OK, everything's OK.
Either way, might be worth having a chat with them also, good luck 👍