Where I live, police officers are spread too thin dealing with real crimes to drive around looking for chickens. Code enforcement officers are not allowed to trespass onto your property to check out what you are doing. They also cannot just drive around looking for violations. Someone has to file a complaint in order for them to start an investigation. I spoke to 2 different county supervisors several times about changing the ordinances and it was not a priority for them. So people just started doing what they wanted. We now have many people in my area keeping chickens, goats etc. against the law because they won't work with us and they don't have the resources to go after all of us.
When I got cited, I had the choice to pay the fine and comply or go to a hearing. At the hearing, it was up to the code enforcement officer to prove we were in the wrong. It is all very stupid and a waste of time and resources. We won our case and haven't been bothered since. Our zoning also states that you must have 1 acre of land in order to own a parakeet. Who can take these kinds of rules seriously?
Perhaps you could get a letter from your neighbors so they cannot retract anything they say at a later date. Mine were more than happy to write a letter for me. One neighbor even got upset with me when I took my 2 hens that turned out to be roosters back to the breeder. He loved hearing the roosters every morning. I might be crazy but I am not stupid enough to push my luck keeping a rooster! Hope it all works out for you.
You might want to check out other cities ordinances as well in order to make an educated case for keeping chickens. I had a councilman from Seattle that was willing to help me with my goat fight and sent me tons of research they did which saved me a lot of time and money. I saw a show on chicken keeping in the city and it said that in Brooklyn NY you can keep as many chickens as you will clean up after. I thought that was funny since NY is such a large city. Sometimes the cities seem to be much more forward thinking than smaller towns.