Hey there!
If the person who gifted you this skin participated in Refer a Friend fraud (abuse), any champs/skins they purchased with the earned RP would be removed.
However, if you don't think that's why your content was removed, feel free to enter a support ticket, and we'll be able to investigate the issue!
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Definitely the Refer-A-Friend abuse.
he already was told it was found to be fraud in his other post. probably cuz he did it himself and named all his accounts with the same first name