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per this news article, it quotes Lynneice Washington, district attorney for Jefferson County’s Bessemer Cutoff Division, as stating that they found the location based on multiple tips.
1. Either there were sightings of known persons she was with at this and other search locations.
2. someone with direct knowledge of the crime reported it. Possibly someone who was with her earlier in the night but may not have actually committed the crime.
3. Persons not involved that saw someone digging at one or more of the searched locations.
no necessarily related to the crime in any way. Also not necessarily only one person who may have saw something they thought was strange.
4. Person or persons who know the person who put her there who may have thought they were acting, or saying things that made others feel as though they may have something to do with it.
I have read several comments that refer to the house as a "crack house, or trap house". I would venture a guess that probably not. The house across the street looks occupied. The previous resident, per neighbors lived there until only a couple of months ago. I would be confident to venture a guess that whoever put her there was familiar with the house. Not to say that they lived there but was entimately familiar with the home, such that they felt comfortable there and did not think anyone would be living there any time soon. A relative of homeowner, or friend of someone who lived there at some point. (for example)