Can you candle the eggs to see how far along they are? If they look all dark except for the air cell they are probably ready to stop turning. You may also be able to see a little shadow in the air cell - if you see that, they are internally pipped and they don't need to be turned anymore. It's okay if you stop turning them a few days before they are 'supposed' to go into lockdown - it won't hurt them. Likewise, I've had chicks hatch in the turner when I didn't know their exact hatch date.
Also, I would keep it on the down low that you got the eggs from the wild. It's actually illegal to take the eggs like that and if the authorities found out you could get fined.