Maybe the construction materials and glass helped them narrow down which dumpster she was put in.
That could have been in a previous dumpster and Somer was put in the next one so that she ended up on top of that stuff but was in another dumpster.
(that is hard to follow, I know ... blood sugar is low)
I followed it Noway, lol. Do we know of any other renovations going on in the immediate area, perhaps near the nursing home? Maybe some of the locals noticed renovations going on within a couple of blocks of that area.