The DCMC Boxers are Duster's Armor when you get him back from DCMC. They aren't very powerful, but you can use them against the Fierce Pork Trooper, who is a big fan of DCMC, to stop him from moving. It puts a weird image into your head, but you can. You can use any other DCMC item as well. It adds seven points of defense to Duster, Usually though, there are better items, so look around. These are really only good against the Fierce Pork Trooper, and they serve no use later in the game, so I'd toss them as soon as possible.