The only problem with that is that I think the whole pack would have to have been eliminated. While the parents might have died, it’s a fat chance the whole pack would have been lost and I think the pack might take responsibility for its pups, even if they’re not offspring of any left.
I’m thinking it likely that the pack would have been killed by the people. Why not, if they were predators, seems likely humans may have routinely killed them if they could.