Citibox Courier Services. Citibox, founded in 1988, has been providing mail, parcel and courier services to and from Spain since 2001. The discounts received from the major courier companies are passed on to our customers so that clients pay a small proportion of the full cost, often less than half. When people discover the true cost of taking their luggage with them on budget airlines they turn to Citibox for help and enjoy that wonderful feeling of freedom.