I'm hoping to find out about the origin of the clear glass jar on the left in this photo, not the milk glass jar on the right.
https://picasaweb.google.com/irvdonald/Earhart75thSymposium?authkey=Gv1sRgCIKup5u7tdXUlQE#5749211342029120626
It's not from the island.
I think someone bought it to use as a comparison with the glued-together pieces which WERE found on Niku (in the center of the photograph).
I don't have any handy summary of the work of the glass-and-bottle group from EPAC. Joe Cerniglia is a very active researcher, and there are a couple of other expert collectors involved, too. They almost certainly said something about the clear glass jar with the blue top on the EPAC mailing list at some time or other, but, regrettably, I don't remember what they said.
I do have a very dim recollection, which may be utterly inaccurate, of someone talking about ink jars. It seems to me that all of the fountain pen ink that I have ever had came in clear glass jars. I have no idea what kind of pens, if any, AE and FN would have carried and used on the flight.
I do believe that if they landed on Niku, AE would carry some kind of notebook and writing instrument with her. A survivor's journal would be worth the investment in time and energy, if they survived the adventure.
This speculation is pretty much unencumbered by any attachment to facts.