It is grammatically possible, but awkward, and if the intended meaning is that you didn't know whether the package was for him or her, then this is not properly expressed.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
It is grammatically possible, but awkward, and if the intended meaning is that you didn't know whether the package was for him or her, then this is not properly expressed.