Do they travel from one one of the country to the other, or within a
specific area?
Problem is that due to the delicate and relatively short-lived nature of
flowers, most nation companies have them prepared by he nearest shop to the
recipient, then dispatch from there. I'm not aware of any companies that can
ship nationally from a central 'depot' (though that's not to say they don't
exist!). Can you not do some subtle enquiries or a bit of 'detective' work
and try to establish where they are going to be over the next few days. (to
the nearest town would probably be good enough, at least then, the flower
company would then know which shop to send the order to, whether they would
accept an order without a specific delivery address, I don't know, but I
guess as long as they get paid...)

Good Luck!