I don't feed crickets to any of my critters, the gargoyle gecko stubbornly refuses to eat them. On occasion I'll bring home a few live prey from the pet store for my stubborn eaters in an empty cricket box, although it's been a few weeks since I even did that. I'll try setting out bait as you suggested, so far I haven't seen any flying insects, but the larvae must be coming from somewhere. I removed the sphagnum moss and placed the egg into a new tupperware which I scrubbed, rinsed with boiling water, and lined with paper towels, just in case the adults are hiding somewhere I can't easily see in the moss.