I like the idea of doing the wallet thing. Not only would it be a huge boon to the people working the international project, but it would show the coolness of the CO scene to the larger community.
That said, I also like doing something different. We could toss the idea around of adding or subtracting something from the carried item on each person's trip. It's logistically more complicated, but would vary the theme.
One simple example of this would be needing to use a little money from the wallet each time. We finally deliver it, get the big reward, and walk off. The punchline is when the dude opens his wallet and finds it empty. Or could be done with food, each person grabs a cookie from the bag & there's only 1 left at the end.
Something a little more complex would be to add something each time. Using a variation of the Lawn Gnome/Rubber Ducky urban legend, we'd have a picture "taken" of some cool Pk move each segment. At the end, the Gnome/Ducky is delivered with a stack of pictures, and the whole clip ends with a quick slide show of each of those pictures from each of the locations around the state.
One last idea, would be that we try to move some object from one place to another, but each Traceur keeps loosing it. In each clip, a Traceur finds the object but somehow looses it each time, the next segment's Traceur finds it, repeat.
One very last idea would be to do it like a Mentos commercial. Does anybody remember these? Lots of ideas could be run here, the whole thing ends with that big fresh Mentos grin and thumbs up to the nemesis.
Objects carried could be wallets, love letters, undetermined "merchandise", collecting litter (going after the dude responsible), school papers, an organ transplant, someone's lost pet (1st clip shows putting the pet in a backpack, the backpack is tossed between Traceur/clips, opened at the end and pet pops out), blueprints, good clothes for a special occasion (prom, wedding, graduation, barmitva), some food item, tape or record with music for some festival, guitar picks delivered to some famous guitarist, picnic stuff, etc etc etc.
Let the ideas flow...