Yes, they get removed to place the wheel on to the balancing machine during tire changes or rotations. You need a special tool, bent wire, or clothes hanger to get those dang things off, so not spur of the moment, certainly planned.
That's right, sorry I misread the original post and thought just the crests were missing.
But I believe fakes are available on Ebay at a fraction of the cost. I know the crests are. I've bought them and it's tough to tell the difference.
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