Apple ID details added inside iPhone case?

Well I received an iPhone for Christmas this year, during set-up, one of the grey folders containing some documents inside had some random handwriting written on the flap. Curious, I logged into this account and this guy has his credit card details etc. Attached to this account. It wasn't secondhand, bought directly from O2 so what do I do? Email the guy, email O2, or just leave it? Confused >.>

Take it back to where you bought it. It sounds as though it's been used before

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