After the commercial break, Walter tells Astrid that if she adds some wild thyme to the jar, it's possible that they can get the moth to transform back. Which sounds, frankly, like a lot of nonsense (it has a deformed wing, after all), but Astrid is still unfairly cranky when she snaps, "I'll believe that when I see it." I mean, Walter actually looks hurt.
Peter doesn't understand how it can be possible that the moth and the man transform in the same way, and Walter says they likely both developed the ability in response to the same experimental stimulus. "Why would the military be testing a butterfly?" asks Peter, the next logical question. Walter explains that the butterfly is one of the few creatures with the ability to abruptly change its body structure, which makes it a "wonderful alpha test subject."
Anyway, in examining Joseph, Walter finds it odd that there's no sign of histolysis or histogenesis, so nothing to suggest a metamorphic ability. "I just don't understand how he can possibly have transformed himself."
Olivia strolls in, letting them know that they haven't found a match on the fingerprints, but they got a hit on the truck's VIN (or, as Olivia calls it, its "VIN number"). It's registered to a Joe Falls with an old address for a house that had been torn down recently. But he was from Edina.
So it's back to the diner with the sheriff, who says Joe Falls worked at the mill, still does odd jobs now and then. Olivia manages to not say: "Correction: still did odd jobs now and then." He asks if "that thing" that tried to run Olivia off the road was him. Olivia says it's possible, but there wasn't a photograph on his file so they couldn't make a positive ID. She asks if the sheriff knows where Joe lives, and the sheriff says the last he'd heard Joe'd moved to the outskirts of town (it's worth noting here that in the establishing shot of Joseph's house there was a neighbouring house a lot more like a regular residential neighbourhood than what you think of when you think of the outskirts, especially in a small town). He couldn't say where, but he's happy to ask around for Olivia, who also wants to have a look at the town records to see if they can find a last known address or photo so they can ID the guy. The sheriff says he'll take them over to the town hall.