My suspicion is that the porous eggs are more vulnerable to being impacted from rough handling by the PO.  I totally agree that the fact that ALL of the undeveloping eggs are porous and that NO porous eggs are developing would be too much of a coincidence to assume that porousity has nothing to do with it.  However, I would have to say that as so many here have hatched out porous eggs that the porosity itself is not the issue.  Hence, something must have happened en-route that impacted the porous eggs but the other eggs were able to withstand.  
Personal differences and breeder versus customer issues aside, it is an interesting question.