Is this correct and natural English? Does anything bother you about it? Thank you.
School principal: Someone has spray-painted the walls of the school with threatening messages. Do you know who it could be, James?
James: How should I?
School principal: Does anybody else here have an idea about who it could be?
School principal: Someone has spray-painted the walls of the school with threatening messages. Do you know who it could have been , James? <<< Better English James: How should I?
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School principal: Someone has spray-painted the walls of the school with threatening messages. Do you know who it could have been, James? <<< Better English
James: How should I? More natural is 'How should I know?'
School principal: Does anybody else here have any idea about who