Peter Carl Faberge’s first egg for the Russian royals is also called the hen egg and was made of gold and white enamel. The inside of the egg had a yolk made of gold within which was a golden hen. The eyes of the hen were made of rubies. The golden hen concealed a miniature crown and at the centre hung a tiny ruby egg.
The Manila hemp is derived from a species of banana originally from the Philippines, whose fibers are tough. The hemp is then used during the paper making process, similar to how Kraft paper uses wood pulp. So the mystery is solved, the manila envelope gets its name from the hemp in which it is made from.