Reg CC says that $100 must be made available on the "day's check deposits". How much cash was given to the customer is irrelevant. The check was for $3000 and, as long as it is a check that is eligible for a hold, you can hold up to $2900. By holding $2800, you are giving them the first $200 available (which you can still do....nothing in Reg CC says that you can ONLY make $100 available).
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Opinions expressed are my own.