I could be wrong here, but I don't think that you are going to find any big carbon can any where in that car, there is only a small one as everyone else uses, there is simply no reason to have a large carbon can.
So, start looking a bit more, find the EVAP pipework under the bonnet, follow that to the EVAP solenoid, then follow that back to the carbon can which traps the fumes collected from the tank.
Edit:- it is even possible that the EVAP solenoid s plumbed directly into the inlet manifold area as it is a charged induction engine - that is where it is on my wife's 1.2TSI Polo engine.