The roosters first goes at crowing are usually a bit feeble, and will give you time to deal with them in whatever way you have chosen.
I would pre-empt neighbour trouble by informing them about the babies and telling them what you plan to do with the males.

 They start crowing at about one year, you can get them fixed by a vet not to crow.other wise take it to the animal shelter, If you have to but then you might as well kill it yourself if you have the guts. So the poor thing won't suffer. But you know, you could be lucky this time, if they all look the same,it sounds like you got all hens. At about 10 weeks old the difference will start to show in the feathers. If you do have a rooster just see how long you can get away with it. Tell your neighbors that you can't kill it but they can if they want. That will shut them up.