u/Incha8

Hello, I have a question.

I moved in a new empty apartment and there I found a couple roaches(german) roaming during the night and discovered a hatched case under the sink.

I treated with gel bait for 1 month then I had no more sightings for 1 month.

Now I keep occasionally seeing a single one roaming every month or so(the whole story started in september 2025). I instantly place new gel bait after every sighting and the following day I always found the one roaming dead near it(they are always different sizes, from nymph to adults). Then no more sighting for another month or so.

The question is, might those be roaming one/coming from sewers or neighbours or I might still have them in my apartment?