Good lord - people, you're all wrong, wrong, wrong
.
It's a jar of marbles. THE jar of marbles we guessed the content of a few weeks ago, to be precise.
(David: don't you dare to reveal something different!
Otherwise I would be forced to send you a box of marbles and you'll be condemned to count them
every single day for the rest of your life.
. Alternatively, I'll send you a box with one female and one male bunny and you'll be condemned to count the bunnies every single day for the rest of your life - your choice).