If more than one exception reason applies you can choose the one that gives you the greatest protection. In this case, it sounds like the reasonable cause hold would give that greatest protection, although I don't know that the mere fact that the check is a third party check gives reasonable cause to doubt collectibility. But it does take the item out of the realm of being an ordinary next day item anyway. In order for a cashiers check to be a next day item it has to be deposited into an account of the payee. If it is a third party item, then it is just the same as any other local or non-local check in terms of availability requirements.
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions