There is a guy who goes by “Cy” who posts videos online of homes he inspects in Arizona. There’s been some crazy stuff he’s found. I enjoy watching his content.

Cryptomator might be a good option. They have clients for Windows, macOS, and Linux. It’s designed around encrypting your cloud storage but nothing should stop you from using it on a USB drive.

IIRC in recent years eBay made it so that if you are one of their “top rated” sellers, buyers can’t leave the neutral or negative feedback for a week. Which is nice and all for sellers that are trying to resolve any issues a buyer may have, but not nice for situations like this one.

I’ve had a Brother laser printer for years now, never given me any issues.