Snape nodded, clearing a space among the stacks of papers with a brisk flick of his wand. One of the two hard-looking chairs that sat on the opposite side of the desk nudged itself outwards. "Take a seat."
He supposed it was most likely that it was nothing, really; a prank, or something more innocent, perpetrated by a classmate. He would relish the opportunity to write someone up for causing a panic almost as much as the chance to catch something more malevolent. "That was sensible," he conceded, summoning the box out of Nott's hands, cloth and all, and allowing it to settle on the empty section of his desk. "You can't think of anyone who might have sent it?" The boy's father couldn't make him especially popular, in certain circles ... but there were enough children with unfortunate names floating around the school that it seemed an unlikely reason to be singled out.
He had a particularly unpleasant flash of déjà vu involving a certain map as he gave the box a preliminary tap with the tip of his wand accompanied by a not entirely hopefully muttere specialis revelio.