The lethal hack of Hezbollah's Asian-branded pagers and walkie-talkies has sparked an intense search for the devices' path, revealing a murky market for older technologies where buyers may have few assurances about what they are getting.

While supply chains and distribution channels for higher-margin and newer products are tightly managed, that's not the case for older electronics from Asia where counterfeiting, surplus inventories and complex contract manufacturing deals can sometimes make it impossible to identify the source of a product, analysts and consultants say.

The response from the companies at the center of the booby-trapped gadgets that killed 37 people and wounded about 3,000 in Lebanon this week has underlined difficulties in discerning how and when they were weaponised.