If you want to bait and try and get some dubias back to restart your colony, try creating a humid, dark warm hide with a source of food like fresh veggies. It might be made using a heavy plastic storage box, setting it up similar to a roach tub, possibly with the addition of slightly damp substrate (cyprus mulch?) and fresh veggies, and placing it against the wall with access doors cut into it next to the wall so roaches moving along the wall have easy access in and out of the tub. The whole thing could be placed on a heating pad.
My father invented something similar when i was a boy to catch snakes that got loose in his car and house (embarrassed to admit that as a pre-teen I lost a few in those locations- looking back the car ones are especially regretable- in those days snakes and other herps were caught on camping trips, etc, and not available or sold in stores)- a black garbage bag with damp grass clippings attracted the lost snakes every single time without fail. Sometimes it took a few days, but they always showed up enjoying the mini environment created in the plastic garbage bag.
Something similar could be tried- black plastic garbage bag with a damp substrate in a warm location in the room- placed near a heat vent or where a heat vent blows on it and warms it. Those roaches are going to seek warm and moisture and food and dark if they can find it.
What kind of roaches are they? If they are Dubias, they will not likely survive in your house because of the weather and temperatures and won't be able to breed as they need it to be hot. In addition to food you could put it in some type of container laying sideways on the floor so they can get into it, also put some egg cartons in it so they can hide. Also if you have some way to suspend a heat lamp over the bin to heat up that area and keep the rest of the room cooler they might be attracted by the heat also.
