How Russell's Parents Knew He Only Had £10 on Him

How did they know that he only had £10 on him? Maybe he had a couple of pounds in his car. And then he would have also had money left over for parking after that. I'm not to discredit his parents at all, but they were so sure that he was wearing black shoes as well, but then they turned up at the holiday home 2 years later. Like, how? How do they know that? The first theory is that maybe Russell had told someone that he was about to inherit £300,000 and maybe that person wanted that money. Now, Russell hadn't actually inherited that money yet. But this person might not have known that. They might have thought that