In addition to the paint cans in the wineceller that were probably moved across the concrete floor to make room for JBR's body, there was also a large piece of black sheet metal that had been on the floor in that room covering what was a floor safe. As far as I understand, that sheet metal had been moved and floor safe was exposed. Some have theorized that the floor safe was consided as a hiding place for the body. No intruder would have known it was there. The housekeeper found it one day and told PR about it.
No one moved that window grate. The spider webs were undisturbed. Spiders are dormant in the Colorado winter. No new web would have been spun. In the dark it would have been impossible to move the grate and replace it (if the "intruder" supposedly exited the same way) and not disturb the web.
The sound of metal scraping had to come from the paint cans or the sheet metal.
I wonder- in that lax investigation, with the spoon from the pineapple bowl STILL sitting untested in a Boulder police warehouse, would anyone have tested the the following for fingerprints/DNA: the paint cans, the sheet metal, the suitcase handle, the metal grate, the chair found blocking the train room with the broken window that the "intruder" supposedly pulled in after him (through a closed door), the Kleenex box (that PR said wasn't hers so the "intruder" must have brought it in).
I know they did test the expected things like doorknobs, the flashlight, pineapple bowl. But it's the unexpected things (NO one would have had time in those 6 hours from her death to PR's 911 call to wipe everything free of prints.) If latex gloves were used, traces of the coating on the gloves would be found. The unexpexcted things could gave held the answer to this awful crime. Gone- all of it.