Surveillance
Seven confirmed 'civilian' sightings in the neighborhood in eight days, and there had been more than enough news footage of a young male matching the product's physical characteristics in the company of the dasypodidaen metahuman. This had to be where he was being kept. The brownstone was a Stark holding, which had brought an entirely new wave of clamor to the boardroom. A few of the more paranoid types were now convinced that the product's escape had been part of some corporate espionage, or prototype theft. Professor Graft didn't care. She just wanted her work back for analysis and possible sterilization if the programming couldn't be corrected.

So, over the course of a few days, there are a few surveillance agents that end up going by the unassuming Brownstone that houses one of the world's premier crime-fighting teams. They're good at their jobs, and all but the best would likely not notice them.