How did he gift you?
Don't you have to have a person on your friends list for at least like 3 weeks before you can gift them?
I say this be cause I actually have gifted somebody I didnt know and just met but had to have them on my friends list for a while before I did.
He (my teammate in champion select at the time) wanted to go mid zed and asked me to pick him so we can swap since I was first pick.
Then I said these fateful words "DW BRO! Nobody plays zed. If they pick him I'll gift you a skin!"
I was quite confident actually. I had not seen a zed picked or banned for several days.
The first pick on enemy side instalocked Zed... thus the skin was gifted.
Good news is we still play together sometimes. I cant remember if we won or lost that game though.