Can I use a found AirTag with no information showing?

The battery may be dead or removed and it is still linked to the owners account. You can try resetting it and see if it will let you add it to your account.

• How to reset your AirTag - Apple Support
• How to add an AirTag to Find My - Apple Support

Re: “… nothing about it is showing up … “

Did you perform the steps listed in

the section …

“Get information about or disable an AirTag“

… of this article? (About 3/4 of the way down the article)

What to do if you get an alert that an AirTag, set of AirPods, Find My network accessory, or compatible Bluetooth location-tracking device is with you - Apple Support