Hi Shawn,
I just built it for 10.4.0 and deployed on an instance of GeoEvent 10.4.1 and it showed up just fine. I also built and tested deploying version 10.5.0 without any problem.
I would suggest to check the Log page on GeoEvent Manager. In my case the Log entries were as shown in the screen shot below.
And the Reverse Geocoder Processor showed up on the list of Processors under the Site/Components page.
If you obtained the jar that built from another machine, make sure to do a 2-step copy of the jar to get around the OS file permission. I normally do this by copying the new jar to my Desktop folder first then copy it in the next step from the Desktop folder to the <geoevent>\deploy. When in doubt, stop GeoEvent Windows service and empty out the <geoevent>\data folder to clear all the old jar caches then restart GeoEvent Windows service.
Hope this helps,
Morakot