Can you identify these artifacts?
The International Group for Historic Aircraft Recovery (TIGHAR) found these items on the remote Pacific atoll Nikumaroro while searching for evidence that Amelia Earhart (AE) landed there and eventually perished after failing to reach her intended destination Howland island. The artifacts were recovered from what appears to be the camp of a castaway where human bones were found in 1940. TIGHAR has mounted six expeditions to the atoll over the last twenty years. Each time new artifacts are recovered and carefully analyzed. They continue to be stumped by these items.

Following URLs all begin with http://tigar.org/

Large pictures of artifacts  Projects/Earhart/help/Artifact5.html

Small pictures   wiki/2-6-S-03a_and_2-6-S-03b

Measurements of 2-6-S-03b   aw/mediawiki/documents/gidgie.pdf

Screw dimensions   TTracks/2002Vol_18/1804.pdf

These may be manufactured or hand crafted. Has anyone seen similar items? Who made them? For what purpose are they used? Can you provide a link to examples of said use? Are there any online resources or books that might list these or similar items?
The screws are brass American No. 8, 15/16″ length woodscrews meeting specifications that were current from the 1930s up until 1970. The metal appears to be aluminum.

The atoll was uninhabited at the time of AEs disappearance. In later years it was colonized by Pacific islanders under British administration. It was abandoned in 1963. During WWII the U.S. Coast Guard maintained a LORAN station on the island. Any of the above are possible sources for the artifacts.

Thanks for looking. Pass this along to one and all. Hopefully we can sove this mystery.