The queens are looking for protein.  Cat food, hamburger, some form of meat. 
If the bait dries on the surface they will abandon it.  Pre-bait sites and 
let the queens plus first generation workers get established at the feeding 
site.  Then set a trap.  This should clean them up early.  Letting them 
become established first will get most of them from each nest coming to the 
bait site.
Dave 

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