To prevent a would-be thief from grabbing your projector box with all of your equipment inside and dashing off, we recommend that you use an earth anchor to secure it. Earth anchors are commonly used in parks to secure playground equipment and similar applications. There are different styles to choose from. Below are a few options to consider:

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ShelterLogic 4-Piece Earth Anchor Kit with 4 Cable Clamps and Driving Rod
Pound one of these earth anchors into the ground using a hammer and the included drive shaft. Pull up sharply and the anchor will wedge itself tightly into the earth to the point where it can withstand thousands of pounds of pressure. Includes 4 anchors and the drive shaft. About $35.

Auger Style Earth Anchor 1/2″ x 30″ x 4″ Screw this auger into the ground by slipping any kind of bar into the loop and twisting clockwise. Will resist up to 2500 lbs of pull. About $35