FINDTAG [Compatible with Android/iPhone & GPS Global Positioning] Includes Replacement Battery

Last year, I bought this on Amazon (around 2900 yen, I believe) for my child, but I ended up buying something else, so it was no longer needed and has been stored away unused.
There was a slightly darkened area from the time of purchase. Please check the photos. It's not very noticeable, but I've included it just in case. The outer box is slightly torn.

Please only purchase if you understand that this is home storage and has been inspected by an amateur.
Those who are concerned or sensitive should refrain from purchasing.

A card for extended warranty was also included, but since the purchase was last year, I'm not sure if it's still valid.
I have not registered it or anything else since purchasing it.

Small Smart Tracker AirTag Mini GPS Tracker Loss Prevention Tag Smart Tag GPS Tag Replaceable Battery Vehicle Tracking Anti-theft Key Wallet Loss Prevention Tracking Tag Ultra-lightweight Good for Seniors For Smartphones/Bags/Keys/Luggage/Pet Collars Ultra-strong Signal Japanese Instruction Manual Included