Neutral service cars and marking wheels...

My son is in a junior road race this weekend and the paperwork says that "there will be two neutral service vehicles - riders are required to bring a spare wheel. please make sure you can identify them after the race."
So how do you mark a wheel such that you are clearly its owner without damaging it? We can't afford to lose a wheel and the one we are going to supply will probably be sold as part of a set in the near future.
And what about his race wheels - how do we mark those so that we can get them back in the event of a puncture?
There must be loads of you who have gone through this, so any advice gratefully received.
So how do you mark a wheel such that you are clearly its owner without damaging it? We can't afford to lose a wheel and the one we are going to supply will probably be sold as part of a set in the near future.
And what about his race wheels - how do we mark those so that we can get them back in the event of a puncture?
There must be loads of you who have gone through this, so any advice gratefully received.
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