Thanks! 'the' is optional before 'letters' if that's the 'the' you're concerned about. But if your audience has already been informed that they will receive these letters, then you have a case of 'previous mention', and you use ' the letters of instructions' because you're referring exactly to those letters you already told them they would be receiving.
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kolokoy I was wondering if you have received letters of instructions for the cash distributions from our manager for all the XYZ accounts.Thanks!'the' is optional before 'letters' if that's the 'the' you're concerned about.