No myth. They are very sensitive to vibrations.

Oh great, So I live near a dangerous snake dumping site!

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You really have nothing to worry about unless you wish to be stupid and try to handle them without either the equyipment or experience. Besides, these kraits' preferred diet is other snakes. So you should find you have fewer cobras and other nasties around to worry about. (I stupidly kept two of the caught snakes in the same box. When I checked on them after about 24 hours, there was just one, with a bulging stomach.)