This guy barrowed me his SD card and I of course lost it like an idiot so I was just gonna give him one of mine and not say anything but the issue is mine are all named after cheeses when you plug them in and I don’t remember what their supposed to be called with like factory settings
What brand? If it’s a SanDisk I just bought a new one and can check when I am home.
You should tell them though. Just let them know when you give them the replacement card. If your card has seen more wear or is significantly older than their card though I would think you owe them a new one.