Why is the proximity to the factory where the nerve agent was allegedly produced of any importance? If someone gets shot with german made bullets, do you think it's more likely the killer was german? Would it be even more likely if the bullet factory was really close? How does that make any sense?
How do you think that plays out? You can send a package from anywhere in the world to basically anywhere within 24 hours, but you think the people who buy nerve agent for political assassinations shop local? To what end? Support local business? And then make sure that the factory is nearby so... so what? So you can bicycle over to the factory, get yer nerve agent, politically assassinate someone and be back home in time for tea? Explain yourself!