I have a bin full of plastic eggs that sits in the attic for most of the year. This week I got it down and pulled out all the orange eggs (other colors will work too if you don’t have enough orange). If you don’t have a stash of plastic eggs handy, don’t worry. You can get super cute, already-filled jack-o-lanterns on Amazon.
After they had found every one they settled down to go through their loot. A short time later they refilled all the eggs/pumpkins (with the exception of a few pieces of candy and favored toys) and pleaded with me to hide them all again!