It rather means "consider it a property of SIAI".
Okay, look, I'm seeking to figure out the reasoning of the statement at a meta-level slightly above "Donate it to the SIAI" and slightly below "consequentialism".
Is it "donate it to the best cause you can donate it to, and since I believe SIAI is that best cause, I'm naming SIAI"? Or is it something like "The friendly artificial intelligence that the SIAI will eventually create has better chances than the hostel management of locating and eventually refunding the original owner of the money, and thus Justice Shall Be Served?"
I'm guessing the former, but it could be a bit more explicitly stated, so we can judge the reasoning behind it.
I just found 120 Euro (about $172) on the floor in the hallway in a hostel in Berlin. What should I do, and why?