Egyptian ships had no keel ... the were basically held together by ropes linking the front to the back and pulled tight. They were not sturdy enough for ocean travel. Even in 600 BC the Pharaoh Necho hired the Phoenicians to circumnavigate Africa.
I would suggest The Ancient Mariners by Lionel Casson for a scientific analysis of the capabilities of the AE ship.
I correspond through email with a number of Andeanists... I'll ask them about the date palm seed.
They who would give up an essential liberty for temporary security, deserve neither liberty or security -- Benjamin Franklin