Those look like body feathers. In the first photo we can glimpse a couple of longer feathers that might be wing feathers, I think they're mostly dark grey. Those would be the most useful to see in close-up for ID. Also, if you can measure the longest feather you photograph, that will help a lot.
Also, where are you located? I'm assuming USA, but it would help to be more precise. Also any info about the habitat where this was found: leafy woods? Pines? Marsh? grassland? Near open water?