First of all I am going to explain the context :
Someone has opened a letter and ask someone in an other room to come here.
The other person asks what is happening. And this is the answer :
I'm guessing this means :
Ootsuka san gave me this, what is it ?
But I'm actually lost on the meaning of こういうの in the middle of the sentence. I know it means such as, like this but I don't see how I should translate it here. I almost feel like it is superfluous. Does it reference the letter itself ? If yes I don't know exactly how I should translate it.