My bet would be a false flag to implicate EFF and their zombies (giving the false impression of ideological distance between them), but a chemical bomb seems more Muslim extremist than communist. Who knows. There's always something that nails the perpetrator.
Knowing the ANC /goverment employees they don't work after 16:00 hours... so it's probably some security guard sleeping on the job while smoking or something.
I don't doubt that, but it's not actually the same police vehicle each time, they have to take turns to collect those brown envelopes filled with Madibas.