Let the OP respond and tell you what to do. If it's an int'l OP I would imagine you get to keep this package, your original order will be reshipped to you, and the other person's order will be resent to them.
If it's a domestic OP, you will probably have to return the contents to the OP, and they will reship your order.
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"Love all, trust a few. Do wrong to none."