I will also add that silkie eggs for whatever reason seem to be more fragile than other breeds. I have had horrible luck shipping them and ordering them. I sent 14 eggs on a test run to a friend (in two different boxes packed in different ways). I think she got 5 chicks out of the deal...
If you do a search for this topic you will find multiple threads touting both sides of the issue. Might be interesting reading.
I have been on both sides of the issue. I have purchased or traded eggs and had horrible hatches. I have bought/traded eggs and had great hatches. It is...