I don't think anyone has taken a polygraph as yet, is that correct? LE would like to get some scheduled and taken, but no guarantee people will cooperate.
I agree totally about the amount of traffic in and out of this apartment; I know times have changed, but this was not a college-aged young person, she is 27, a grown woman. Way too many people, especially men. But we can't change that part of this case, unfortunately. It just makes so much more work for LE to try to narrow it down. The place must be packed with fingerprints, etc.
Please, someone, have a heart...tell the police what you know. I feel certain that more than one person knows what happened and where P is...
Just my opinion, of course.