Many light poles in and around parking areas have a moveable cover or skirt that covers the bolts holding the light pole to a concrete base. These skirts can often be lifted, and a small cache can be hidden underneath.
Saying that, Skirt Lifting is definitely frowned upon for obviously reasons Today is your lucky day, this type of Skirt Lifting is very much different. Good luck!
Stealth may be necessary to obtain the find.