Moral dillema [Got a free skin]

So i am in a moral dilemma.Recently i bought some rp on my third acc in order to buy some champs to climb faster and i gifted my main acc with a mystery skin which was red card tf.When i logged into my main i recived tf and piltover blitz which was obviously a bug gift.Piltover blitz doesnt show in pruchase history nor gifting history.So here is my dilemma should i keep quiet and just keep the free skin or should i contact support? I feel bad for keeping it since i am not that type of a person but i still hmm....So keep it or dont keep it?
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