Some gumpaste can't really be shipped safely.
Stargazer lilies are one of the flowers that I don't ship because they tend to break too easily. If I can't ship it and know that it will get there I don't bother.
I made these for a local customer who could pick them up, so there's no shipping required. And it's a good thing, because right after I took this picture I dropped two of them and now there are extra petals drying so that I can replace the ones that broke. That's an indication to me that they would be likely to break in transit when the post office played soccer with the box.