I paid someone 0.1 bitcoin for a ~$30 item in 2013. I checked the receiving wallet in 2014 and it hadn’t been accessed. I reached out to the guy and told him it was worth $60 and asked him if he had access still. Explained to him how he could access it, gave him some links. I reched out to him again in 2021 and told him it was worth $4k and told him he should sell it. He said he didn’t remember how he set up a wallet and he couldn’t access it. In the end I think he likely downloaded a wallet to his computer and then got rid of that computer. Just checked today and that .1 btc is still there, worth 9600 now.