Ok, I baited the trap the last two days with canned corn, including a path leading up to the hole. Each day, every bit of the corn was gone, but the trap not set off. I'm wondering if the %$^*#% robins like canned corn.
Speaking of the winged rats, I accidentally left a small hole in the bird net covering my two bearing blueberry bushes. One bush had been completely harvested but the other bush had about half the berries left. The @#$@^$# birds found the hole and ate every single blueberry in one day. I was going to pick them the next day, but too late.
On the GH front, the property owners apparently cut grass earlier today and also cleaned brush away from the GH hole near our property. I was going to bait the trap again, but appears the neighbors have filled in the GH hole. Not sure if they removed the pests (or otherwise did them in) or just locked them in for a time.