Technically you need to call Amazon and return their property otherwise you are handling stolen goods.
To stop Sharing Your Location, you must open the Find my app tab.
Choose the Me tab, and then turn off Share My Location.
There is an option to stop sharing with a specific person. In the People tab, pick a contact you want to stop sharing location, scroll down the page and tap on Stop Sharing My Location.
NOTE: This will also stop you finding your phone if you loose it so it’s at your own risk.
Alternatively turn off GPS on your phone.
The problem is AirTags and Galaxy Smart Tags exist, if they had you on an AirTag your phone would alert you if you was being followed, if it’s a Samsung Smart Tag you would need to borrow a Samsung phone and it would do the same, sadly there are also full GPS trackers that can be hidden in or under cars that can’t be easily detected.
Ideally we need to see the notification, RAV is a real product but that doesn’t mean that the notification is real as many websites are infected with notification malware that sends fake notifications to the users browsers (if the user accepts them) and they usually try and get you to fix issues by installing malware and viruses on to your PC.
Sounds like your email account is what has been compromised, change your email password, add 2FA and sign out all devices. then check there are no forwarding rules setup and that they don’t also have any other rules set.