Can you pen them ,load them and haul them to an auction. Not sure what ID they would have to substantiate whose they really belong too. If it gets back to the so called owners ,deduct feed, penning and shipping fees plus labor from the cheque ,there should be nothing and most likely they will still owe you money .
As far as shooting them all , well unless they are mangy and diseased I would feel kinda bad about that as it really is not the stupid animals fault their so called care takers are @ssholes. It is just a shytty mishap of circumstance . :roll: I have never thought about shooting my neighbors cattle . I have however thought about running "them" through the tub grinder and feeding them to the pigs down the road . ;-)
Good luck ,know exactly where you are coming from and it is very frustrating to say the least . Am planning big things for a certain neighbor and if all goes well ,,,,, that is for another story at a later date . :cowboy: