Can you permantly delete your details from an apple product?

Basically, someone stole my iPod and I'm pretty sure they restored it and have turned off iCloud as it does not pop up on find my iPhone.So, say the person who stole it doesn't have it anymore, would their apple ID still be available to examine on the "support profile page" on "previous devices"? If they deleted all the information and restored it can you still identify who is using the device

***Please ANSWER

Restore clears all.

Drop it off a cliff into a river then celebrate cuz your free from an aplle device. Yes i spelled aplle wrong.