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Okay, you seriously just won the thread. As you have instructed, from this point forward I will distrust everything you say.
Seriously though, if chickens were a major part of the diets of the foxes where you live, a red fox would
never just cross your land. Red foxes hoard food. They would be after each and every one of your chickens constantly if your birds were "what they were looking for." They are opportunists. They eat what is convenient. Clearly, the OP's neighbor's chickens were convenient. OP said that his neighbor went out of town for a week. OP said that his neighbors left his chickens loose during that time. That's not exactly the best way to keep your animals safe from foxes. Or from coyotes, hawks, owls, feral cats, loose dogs, raccoons, snakes... you get the idea.
As far as foxes not being scared of humans, though, there was a study done in England not all that long ago on that very topic. They found that while country foxes still behave as foxes typically do (avoiding people and pretty much anything that smells strongly of people), city foxes have begun to adapt. They are larger and they eat literally everything that people eat. Like raccoons, they are thriving on what we throw out. Additionally, since people who live in cities tend to be less wary of foxes than people who live in the country (city dwellers don't have livestock to worry about), they feed the foxes. Generations of foxes have grown up this way and the foxes who don't fear humans are reproducing more successfully than the foxes that do. The "fear humans" gene is being bred out. So if you live near a city that could account for the behavior you're seeing. Similarly, if you have neighbors who don't secure their garbage or who leave food out for the foxes (intentionally or not - they'll eat dog or cat kibble) then your local foxes could be showing the same behavioral changes that the London foxes are. But your experience is anecdotal and can't be reliably applied across the board to all foxes. I could recommend a few books on fox behavior if you're interested.
IMO, across the nation, both coyote and fox populations have risen, and both species seem to have to adjusted to living in close proximity to humans in rural and metropolitan areas alike. Neither have had the hunting pressure once suffered when there were numerous small farms, each with their own livestock and poultry raised for both food and income. With raising our own meat and eggs now becoming popular again, fox in the hen house is also becoming a revived saying.