I read your post the other day, but I cant quite remember all the details...did you just lose a couple, or was it all of your chicks...guess we need some more details so we can help...
Hope there havent been any more losses, or maybe you found those who went missing? We have 2 barn cats besides our pet cats that just showed up, so we care for them...I know one of them for sure picked off one of my layers earlier this summer that happened to be outside the fence on her own, and I was pretty upset about it...one of the cats is gone now, but I saw the other one is back and sniffing around the chicken run, I try and scare it off when I see it, probably can smell some fresh chicks out there...I tell ya, I better not hear any ruckus out there, or someone will be going down!
Anyway, I guess if you had more details, you might get a better response..
Again, hope there havent been any more losses, seems if a predator is around, they will keep coming around until there is nothing to come back for....good luck!