Got an iphone 6 refurbished how do I register it to have a warranty?

It said that the iphone 6 comes with a Warranty I'm a first time buyer and did not find anything like that in the box. It said manufacturers warranty but I did not find any paper like that in the box. How do I register this phone to have a warranty? I bought it from Ebay.

You can register it with Apple for a apple care+

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