I would think if the burlap bags were used they would be able to figure out what had been in them previously or where they came from.
With craigslist off the market now, I wonder where this guy would be going to hook up, and I would also be looking at guys with previous prostitution arrests.
Also it is hard to believe that the police have not done more with the"john" tha Shannon Gilbert was with last. The one news article said, he said she was there for an hour, while her driver said she was there 3 hours? Something doesn't sound right there, if I am the police and she was at his house last. I would have to get a warrant to search the property, plus she left personal items there, that doesn't sound right. I would love to get his name to do more sleuthing on him.
Here is my early thoughts, I have been close a few times before:
White male, 35-45, single but could very well be divorced, paying child support, has deveoped a hatred for women, but craves sex, obviously some mode of transportation, blue collar worker, construction, factory, loner type, will have some criminal background, prostitution, assault, drugs. I think he will be a Long Island resident, grew up and stayed there. Familiar with the areas where he dumps, fits in there.