I've notice (after working for at  different vet hospitals a good part of my life) that the individual cremations go with the "simple cremations" on the same truck...
  
Perhaps that pretty little box is not the precious remains of your baby....  
The truck will often take 10-20 frozen bodies at a time....I never asked, but I would imagine that a large bonfire takes place, depending on how many "pickups" there are on their rounds..  
this is not to discredit the "disposal" company...they provide a service, but how do we "know" if our ashes we get back are "ours"..... I don't think they are regulated as a business  



, but I'm not sure.....  
I bury my pets in the backyard, but I know some live in apartments and places where it is not allowed by law......
  
roxanne