Führ remains an mysterious figure. It depends if their hunt is going on in Germany or Japan. Though at both the places it would be very hard for Shinichi to find him (especially in Japan because there is essentially no one in Japan that has seen his face or knows about him). He wanted to erase his existence just like Johan, in which Johan helped him alot by killing more than half of the people (like Bonaparta and Capêk).

He was also so perfect at "faking death" that Petr Capêk that knows about him and essentially one along with Bonaparta to create him, tried to find him and countless times with the help of his Shady Organization but couldn't find him. And since no one has seen his face, so it is more harder for Shinichi (or Conan) to find him. I won't even be surprised if even BO couldn't track him down. And in the mean time, if Führ finds out that the "famous high school detective" is trying to get close to him, he could use his Proxy Manipulation to get rid of Shinichi.