The BMW of Viktor's goons has no front license plate. This is an absolute no-go in Austria and would result in an immediate stop-and-search operation if spotted by the Police. Additionally, the rear plate as well as the plates of Viktor's Mercedes start with an "H" and "R", respectively. Those prefixes are not used in Austria.
It makes no sense for Viktor's goons to transport their guns unsecured and loosely strewn all over the trunk floor of their Mercedes.