He forgot to mention that his dog ate his paper wallets.
Or like this man, his mom found the paper wallet and trash it.
How do you safely keep your recovery phrase written on paper?If people are not tidy enough but careless enough, their wallet backups will be left in public places, and many people can see these backups, or these backups are left in locations that are unsafe.
Yesterday, my mom did a general cleaning on my room and when she's done, I saw the recovery phrase of my Trezor hardware wallet on the garbage can which I placed on my computer table
Perfect example of how "unfortunate events" or unlikely things do happen..