The introduction of coir into the story of Oak Island is worth of a closer look while paying close attention to when it is mentioned, who mentions it, and where it was found. A not there during one excavation, then there for another excavation.
Recall this material was originally reported as a type of Spanish grass....
To save some time.....
Alfa \Al"fa\or Alfa grass \Al"fa grass"\, n.
A plant (Macrochloa tenacissima) of North Africa; also, its
fiber, used in paper making.
Esparto \Es*par"to\, n. [Sp.; cf. L. spartum Spanish broom, Gr.
A species of Spanish grass (Macrochloa tenacissima), of
which cordage, shoes, baskets, etc., are made. It is also
used for making paper.
You may also wish to view the following link.http://en.wikipedia.org/wiki/Esparto