Take a look at the form you use for exception holds. If it's based on the model, it will have a check box, "Other." Just write "savings account" next to that box - don't embellish.
As a matter of courtesy, I think it is important to give the customer the written notice. However, I would pointedly mention that there is no applicable record retention requirement; I would destroy the bank's copy at the end of the hold period.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.