Please help to recover stolen volleyball!!!

On July 28, for the second time in about one month, my volleyball was stolen. As it happened the first time, it was stolen from my car. This time the crime took place at the St. Pieters train station in Gent. The last the ball was seen was at Victoria station in London.

The person who can bring back my ball by next week will get a big reward! Below is a picture, taken by an undercover agent, of the thieves - with the ball!