Perhaps your right i have no idea how to make a resin cast and that probably would leave a residue but i assume it could be cleaned off and remove residue entirely?

It is the best i can come up with.... I honestly know nothing about official star wars prop services but they got that from somewhere so perhaps they can put ady in touch with their supplier?

The other thing to perhaps make note of is even though they list it as having one in stock there's nothing to say that they sub hire it in from somewhere else. But if they do own their own one then atleast we know where to find an alternative.