Langdon and Sophie hurry to enter the ten-digit number Sauniére had written down into the computer, but Sophie hesitates, feeling like the scrambled Fibonacci sequence is too random… and they only get one shot.
She types in the Fibonacci sequence in its proper order, and hits enter.
Eventually, a giant, industrial-looking crate appears on the conveyor belt.
Inside is a smaller, polished box made of rosewood. On the lid is a hand-carved five-petal rose inlay—which is a Priory symbol for the Holy Grail.
Langdon and Sophie both get excited that it could be the Cup of Christ (even though Robert already knows the Grail isn't actually a chalice), until they hear liquid sloshing around inside.
They open the box. Whatever is inside is not a cup.