am I the only one who is worried the kittens got taken away from their mom? If she is a typical feral cat she would vamoose when people come by, so the workers would not see her, just the kittens, and assume she "dumped" them. I don't think too many mother cats do that to kittens that young.
I am glad you are bottle feeding them but if they had stayed with their mom, it wouldn't be necessary.