A friend of mine gave me two gifts, but I cant find them. I didn`t get any
pop-ups or something that says I have recieved the gifts and there is
nothing new in my owned accesories. Why can`t I find them? And why
does this happend? Anybody who knows?

You probably should have them now.
Just relog.

I still can`t find them :/
They would have been in my "owned accessories", right?

You would've received a notification you had a gift actually.