It could be a scam, or maybe not.
Would you go to a strangers house with that much money hoping that (they actually live there and aren’t just waiting outside a strangers house!) they do have something for sale and that they’re not just going to rob you?
There was a program on TV a while ago about scammers selling dodgy cars outside addresses that they didn’t live at, so when the buyers went back to the address for their money back, nobody at that address knew what they were talking about.
A guy came all the way from Newcastle to Edinburgh to buy my bike, he didn’t have the money on him “just in case”, and he had to go out to his car and get it when he decided he wanted to buy the bike and I wasn’t going to rob him!