Hmmm, let me think on how to handle that.
So right now, prints that come with collectibles should be added as parts to the collectible.
Ideally what would have to happen, is you would submit a collectible, linking that print as a part but then would have to indicate somehow this was a not a purchased or sold collectible.
Let me think about how I would get this to work, I think right now we don't easily support it but you could submit a new collectible as a print, from SSC (which I would have to update) and then make sure that you link the part from the statue it came from.