My first thought is to tell you to make an Item of Power that grants glamours and something else. The simplest solution though would be to just make a sword cane. That is (I am going to explain what it is even if you know because I over explain things...its a character fault of mine) simply a sword whose sheath looks like a walking stick or cane, the hilt looks like a walking stick or cane as well so as to not ruin the image. A downside to them is that there is no cross guard nor does it have a basket hilt so there isn't anything to protect your hand if someone does a manuever (I think that it is called a glissando, which is also a musical term) where someone uses their weapon to divert yours and in the process lets their weapon slide down yours to strike at your fingers. That being said, they have had weapons that are disguised as harmless ordinary items for a loooooong time. Since this is the modern age and we have a pretty good grasp of machining and engineering, he could even have a button that he could press that would release the blade from the sheath so that it could pass mundane examination...wouldn't pass an X-Ray machine (unless the sheath was made entirely of metal as well, which would raise suspicions.), but neither would an enchanted item. For those, just hex the heck out of that nosy machine...
