If you want to mount USB in Virtualbox, you have to do this solution. At the time of this post, a typical Google search for this would go to a solution at advocated using the attachusb command in VboxManage in the Vagrantfile provider customization section. This will not work because the VM is off at the time of bootup. It looks like the original author of this gist did not repost his solution back to the thread.

The solution, in other words, is to use USB filters to automatically connect devices to your VM. USB filters can be added while the machine is powered off. They’ll be applied upon boot or, in this case, vagrant up.