I have done a few intros now, TBH just sticking him in your girls box was not the best to do, as that would feel to your girls like their box!

Intros can be a bit hair raising! your girls hissing is a warning to the hob. and chuckling is a happy talk. It is best to put them in a neutral place and let them work each other out. It can be vocal but as long as no one is pooing themselves or there is blood you are getting somewhere. Try bathing them together and then they can roll about together and all smell the same also letting them share a treat of Ferretone too, even put some on each other.

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when i was very young my brother and me used to breed and work ferrets....the biting of the neck thing is a mating thing,could be that the jill is staking her claim on the hob