I would expect to see this on plastic foundation and have never seen it on wax. This was done by a bait swarm at a very marginal site in a redwood forest. We had failed late flows due to lack of rain, and this site has no late flow anyways. This was the first year I put foundation in bait boxes and was surprised to see several swarms did a poor job on it. Maybe it was a drone layer queen who needed some drone comb. See my nice new Kelleys hive tool? Got that on the free freight For Thanksgiving offer.