How can I get past the Slaves?

Hint 1 of 12:

Have you been to the Royal Museum?

Hint 2 of 12:

Did you meet Callimachus and Apollonius?

Hint 3 of 12:

Have you looked them up in the dictionary?

Hint 4 of 12:

Maybe you could play a little trick on them?

Hint 5 of 12:

Have you found anything that might help, a poem or two?

Hint 6 of 12:

Wait around at the Bird Cage.  Someone will put two tubes in the
pigeonholes.  Examine the tubes.

Hint 7 of 12:

One has Alpha the other Kappa. I wonder what that means?

Hint 8 of 12:

The Alpha tube has a poem for Apollonius and the Kappa tube a poem
for Callimachus.

Hint 9 of 12:

Now for the joke.