The young Japanese lady of the Utsuro-Bune has the knowledge of flying-saucer technology. I believe the gold box contains special diamonds, gold and crystals that power the propulsion system of her spacecraft. The reason she chose not to open the box in front of the Japanese people is because she was afraid they will take the diamonds, gold and crystals away from her.
I believe the legend of the Tanabata Festival is related to the woman from the Utsuro-Bune spacecraft from the year 1803 in Edo, Japan. She can only meet her lover once every thousand years. One thousand years are required to gather all the unique diamonds, gold and crystals from the vast Milky Way to power her spacecraft to see her lover.
I believe the young woman of the Utsuro-Bune is a real person and the Tanabata Festival is proof of her travels collecting diamonds, gold and crystals throughout Japan in 1803-1844. She is from an advanced civilization.
The geometric symbols from the Utsuro-Bune spacecraft of the circle with a triangle have also been recorded from a military Air Force Base derived from the UFO incident in late December 1980 at Rendlesham Forest, Suffolk in England .