Funny (not actually, kinda sad) story:

I know someone who bought a “physical” silver bitcoin at an event in 2014 for around $600 in cash, which included the cost of 1 BTC at market value.

He didn’t realize at the time that he was supposed to register it when he got home by entering the serial number into a now defunct website in order to have the address funded.

Years later, he asked me if I could help him. I did some research and showed him how could check the private key using Electrum, but lo and behold the balance was zero, and it was about 8 years too late to claim his whole bitcoin. nostr:note1yhkpnemmqupdhvdm404dfx90v7wudlsy0xj60wpvmnqz3l3uvf9s7w6d6e