This is nothing new...I've had several books taken from packages here over the years, some they didn't even have the decency to tell me about, until I made a fuss and THEN they said, yes we removed a book from your box. Funny -- where I come from, taking things from people without telling them is called STEALING. One book was called "Why I am not a Muslim" -- they made me send it back outside the country (and I promptly brought it back with me in my luggage on my next trip). Others were paperback airplane reads with "questionable" cover illustrations. One was a murder mystery with a Star of David on it, so I guess they thought it was a Zionist infidel manual or something...LOL! Ridiculous really -- you can see naked bits on TV every night, but you can't read about why someone would choose to leave their faith, and you can't have ANY display of the 6 pointed star symbol...
Ramadan hours will probably mean that unless you can get to the MOI by mid-morning, you will need to wait until after Eid. There are different MOI/censorship offices around town for various things (books one place, pharmaceuticals another) so ask DHL which building you need to go to. They should provide a location and office number for you.