'Mr. Manager, you hold in your possession the key of this glass case?'
'I do.'
'It was locked in your presence thirty days ago?'
'It was.'
'Since then the key has remained in your possession?'
'It has.'
'To the best of your knowledge and belief no other key to the case is in existence?'
'That is so.'
'The case has not been opened by your orders, or to your knowledge?'
'It has not.'