First off let me say Thank You very, very much for your help!!!
I finally have it all working with your changes and with 23 boxes the elapsed time is usually between 8-10 seconds(which greatly improves on the over 30+ seconds it used to take). I am sure this can be improved upon if I fix my code a little more. I also imagine that I can fire off more than 5 threads at once and still be ok, so if I can figure out where that watermark is than I can get the most out of all the tweaks that have been made(Benchmarking my code will come in handy here). Finally, I really need to shore up my error checking so that I can cover timeout scenarios when the boxes are not reachable.