If the red box you click on is locked, get off the box by clicking somewhere else. It can be to the side if the box, but I find it safer to click on the avatar on the friends bar. Then click on the avatar again to reopen/refresh that farm, and the box will be on the farm somewhere without the waiting time. If you click the x the waiting time for a new box to appear is random, could be up to 40ish minutes.
if the box opens, collect your goodies, go back to your farm and harvest something. I keep a small amount of wheat on the go specifically for this when i hunt red boxes. Go back to the other farm and the box should be there again.
you can try a LOT of times to find a box that opens. 50 odd boxes not unusual.
On .greg's farm the red box is usually on the road, hiding just behind the tractor at the road entrance, behind the farm house (look for the sparkles) or under/behind the big tree to the right of the house. Also, since the new land expansion, in the new strip of land at the bottom.
hope that makes sense.
Some days I got more mining equipment from wheating and hardly anything from the red boxes. Other days I got it all from red boxes.
Keep on selling the wheat and advertising it. You need quite a few boxes to do it easily so it helps to have lots of friends or buy extra slots with diamonds. Keep advertising, you get a new ad every 5 minutes. Use it! Advertise a new wheat box. Some days I've had to advertise 4 different boxes before someone swoops in and buys everything.
Good luck!






