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The only way I can think of is by detecting the presence of a magnetic field around it. Of course, you can simply put it near your (CRT!) monitor and watch if the colors get twisted around, but that's what you try to avoid, right? Still, if it was sold as a computer speaker, it probably is. If you've got an old black-and-white TV set somewhere, you can swing the speaker around it without fear, it can't harm it, and if the picture doesn't distort, it's shielded. If you've got an LCD monitor, it doesn't matter, they are not affected. Or you can just open the speaker enclosure and see if the speaker magnet feels significantly magnetic to a piece of iron. Shielded speakers actually have another magnet stuck to their back, that cancels out almost completely the actual speaker magnet's field. The two magnets are oriented such that they are actually repelling each other like mad, otherwise they would add up their fields not cancel them. So there you go...
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Q: How do you know if a speaker is magnetically shielded?
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