The previous owner of the iPod touch doesn't remember his apple ID
How can I reset the iPod touch without the previous owner id if they forgot it?
iPod Touch (5th Gen)
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Here's how they can find it:
Forgot user ID: https://iforgot.apple.com/appleid#!§ion=appleid
Forgot password: https://iforgot.apple.com/password/verify/appleid
The they need to do the following:
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support