Was taking a look at the passport stamps:
We've got stamps from Hong Kong, Macau, France, and Brazil, but there's also a Schengen visa and a German exit stamp, probably collected when flying out of Schengen through a German hub?
The most prominent date is that for Hong Kong, with an entry stamp dated 19 Apr 2015, three months before the racers passed through. Might have been a production run.
Slightly strange that they got passport stamps for Hong Kong and Macau in the first place; I thought they discontinued stamping passports back in 2013.