Yes, and unless it's changed, it should be archived. The accuracy of the GPSr is not enough to tell you that you're in the right spot to start pushing gravel around.
This means you must root around in the gravel looking for the cache and that disturbs what sounds to be a private company's landscaping. Even if they gave permission for the cache (and I doubt it), I doubt they knew what they were allowing when they go out to find all the gravel shoved about or out of the box later from cachers who started searching in the wrong spot and did poorly to recover the situation.
I don't agree, How is peagravel any different than leaves, bark, or trwigs. Where is the line that an items is covered as opposed to burying? I think that since the peagravel can be move with your hand it's not burying. Besides the reason for the rule was to protect the land for people digging holes to place caches, how is anything destroyed is the peagravel is move and then replaced? I mean peagravel moves if it's stepped on, so movement to find a cache would not be noticed.