As said, Olmesu searched every record in every school, every hospital,... any place that could have any idea of who Doyle was before he became... whatever he is. What he didn't know, however, was that his moves were being monitored.
A few weeks earlier, Hammond had come to a very interesting conclusion: that the one he called Al was developing two separate minds, one for Doyle and one for Roxton. Knowing this, he felt he trully needed to get his hands on Doyle as soon as possible. Having that in mind, Hammond decided that since Doyle has amnesia, there's still a possibility that he may somehow regain his memory. Knowing that, he created another monster, that would be able to spy on every place from Doyle's past, that might mean something to him. It would look like Olmesu was getting closer to an answer, as that monster returned to Hammond at some point.
"Hammond-sama!" it called, "Hammond-sama!"
"How nice it is to hear someone call me 'sama'." Hammond laughed, "So Morirabbity, did you find Al?"
"No." the monster, Morirabbity, answered, "But..."
"Then why did you come here?" Hammond asked, getting furious.
"Because we... I saw someone getting in and out of all the places you told me to watch."
This seemed to surprise Hammond: "Oh?"
"I didn't see Al, but I did see that man." Morirabbity repeated, "Do you think you're not the only one looking for him?"
"Maybe..." Hammond said, "... or maybe... could you take that man next time you see him?"
"Already on it, Hammond-sama."
And he wasn't lying. When Olmesu was about to walk into a elementary school, which happened to be the same one that Mai attended, he was confronted by what looked like a human-sized rabbit, who appeared to be having an old man's balding head. And that hair was as green as that green bit you'd find on top of a carrot when it's pulled out of the ground, not to mention that it's skin had the same color of a carrot. It was Morirabbity.
It said: "Two times one is two."
After saying that, it multiplied into two such monsters.
"Two times two is four." it then said, after which there were four of him.
Each one of the four carried around what looked like an old man's cane, which was used to beat Olmesu unconscious. Though he tried to put up a good fight, there were just too many for an old man to handle alone. When the fight was over, Morirabbity made the other three of him disappear, so he would carry Olmesu away himself.
What he didn't know, is that Mai had seen this happening outside her classroom window.