Daniel agreed to speak with the police at the school.
He did not deny being there on Friday.
He said he had entered through the side door to return a box of old music books that belonged to the school.
Because the front office was closed, he left the box near the kitchen and planned to send a message later.
His blue scarf matched Leo's description, and he admitted carrying a black case.
But the case contained his own damaged violin, which he had taken to Mr Han's shop before visiting the school.
Mr Han confirmed that part of the story.
Daniel also said he had seen a delivery van parked behind the building.
A young driver was moving boxes while talking on the phone.
One box was long and narrow, much like an instrument case.
Karim realized that the dragging marks might have come from a delivery box rather than the stolen violin.
The investigation suddenly turned toward the deliveries made that afternoon.