Actually there are two different pieces of "mystery" evidence in the Oregonlive pictures, and they seem to be in two different areas. The rag is surrounded by vegetation on a slope, while the white thing is on flatter ground near different trees.
The following two pictures have the white piece of paper/receipt or whatever:
http://photos.oregonlive.com/oregonian/2011/01/search_for_kyron_horman_12.html
http://photos.oregonlive.com/oregonian/2011/01/bnkyron.html
These next two have the red rag:
http://photos.oregonlive.com/oregonian/2011/01/searching_for_kyron_horman_3.html
http://photos.oregonlive.com/oregonian/2011/01/searching_for_kyron_horman_12.html
The following two pictures have the white piece of paper/receipt or whatever:
http://photos.oregonlive.com/oregonian/2011/01/search_for_kyron_horman_12.html
http://photos.oregonlive.com/oregonian/2011/01/bnkyron.html
These next two have the red rag:
http://photos.oregonlive.com/oregonian/2011/01/searching_for_kyron_horman_3.html
http://photos.oregonlive.com/oregonian/2011/01/searching_for_kyron_horman_12.html