I'm am confident they were for food. It was a large Indian family: an older woman, 2 grown men who I suspect were her sons, their wives and a ton of kids. Two mini vans full. The older woman looked like she was weighing the birds by feel.Well, in that case.. cock fighting would be suspect and I'd a said no thank you..
Unless I felt they were just trying to put me at ease and were indeed going to feed their family and I hadn't specifically stated NO eating.. Some folks even say "just don't tell" them.. they are okay with it but don't want to know about or contemplate it.. Which seems to be the route you think was taking place. And honestly.. all birds here are raised and treated like pet chickens.. enjoying every day and having one bad moment that's over before they realize or can think about what just happened to them. I prefer honesty and any shadiness is a flat deal breaker for me.. but I would also communicate that and realize that we, including whoever took your boys are almost always doing our best to survive.
Although many back yard keepers worry about our fluffy boys being used as bait cocks.. it's really not that likely.. game fowler's are often hard core about what they do and our boys are not worthwhile. Not saying it doesn't happen.. know you're area, be informed, and make YOUR best call according to your expectations.
I suspect they had a bad experience with someone saying it was okay to eat them to get them to admit that was their plan and then saying 'no deal' once they told the truth.
My birds have some game in them so I doubt theyd be bait but they arent pure so they're not useful as fighters either. I would definitely not sell to anyone I suspected of cockfighting. Killing the birds, totally fine. Good life and swift end. Abuse, not a chance!