Oscar made a huge assumption *SPOILER*

Personal belongings from the workplace were given to the next of kin by the driver's partner if the driver died while performing their duties. I'm not sure, though, that this rule would apply in a situation like Oscar's - he made a massive assumption that his belongings would still be given to his wife in the circumstances, and not, say, handed over to the police or kept by the company for a while for further investigation.
Very clever ending and I loved the film, especially first time round when I was kept guessing, I just thought it was a stretch that his wife was given the goods on the same day (and still by his partner and not by the police or the boss etc). Then again, he and his family would have starved if he hadn't made a move, so he had nothing to lose if it hadn't gone to plan.