OP
Thinking back, I remembered a trick that worked at least a few times. The primary den hole came up in an open space of the shed floor. I laid a cocked connibear 330 (a bit of overkill but it's what I had) over the 10-12" diameter hole with a sheet of newspaper gently placed on top and a bit of the loose shed floor dirt around the edge to prevent wind from blowing the paper away. Caught 3 in just a few days including a huge, grizzled specimen. Apparently, the newspaper covering prevented the animals from seeing the trap's trigger wires as they tried to push the covering aside.