Report from 101 Roehampton

I spent about half an hour talking to tenants of 101 Roehampton. This is what I found out.
Few of them saw big black backpack behind the building. One tenant describes it as "very big, very full".
The tenant who lives on the ground floor and has his little "backyard" moved the backpack several times, but did not make anything of it because he NEVER KNEW that the girl was missing, or that the description of backpack was in the media. When the backpack disappeared from the spot he saw it last time, he thought that someone had found it.
I spoke with another tenant who told me that, when her car was vandalized in the underground garage few months ago, she reported it to the superintendant and asked him if he would call the police, and he told her that there was NO POINT OF CALLING!!!! the police because they would not come anyway. The tenant called police by herself and police was surprised that anyone gives an advice NOT TO CALL THE POLICE. I am telling you this just to describe that the super of that building may not be very smart and vigilant person, therefore, it does not surprise me that he did not call the police either. By the way, his apartment is located on the ground floor, right next to the apartment of the tenant who was moving the backpack around.
Another tenant also saw the backpack, and she said that it was there for a long time, but she thought it belong to a student from North Toronto Collegiate that is just across the street from 101 Roehampton. She said that students from that school go behind their building all the time, to smoke and just hang out there.
I cannot believe that the backpack was there all the time, and with all the coverage about Mariam, NO ONE FROM THAT BUILDING noticed that backpack resembles the one belonging to Mariam.
Also, what is the likelihood of such an important piece of evidence to be hidden from view in the backyard of a person WHO EVEN DID NOT KNOW THAT MARIAM WAS MISSING!!!!
Also please note that there are two high schools close to 101 Roehampton. One is North Toronto ( just across the street), and another one is Northern Secondary ( about three blocks towards east ).