you should be able to identify this in your sisow account i would have thought.
(as sisow does not actually return that info after an order has been successful)
that said, there is probably a way to identify this in th ewpppizza orders table too somehow.
however, this is currently not implemented, but i will make a note of it to do this in an update (but o cannot give you an ETA at the moment as to when that will be done)