Modified toner cartridges it seems.
UPS returns used toner cartridges for recycling at no charge to the shipper. I’ve sent them several over the past several years. Their portion of enviros green agenda.
If they are IED’s one method that would not involve a timer is to ship it without one but with a wired cell phone. The local operative would have the cell phone number and call it when it is nearing the destination.
Fox News confirms DHS has ‘concern’ over multiple suspicious packages originating in Yemen aboard cargo flights at Newark, Philadelphia, Chicago and NYC area; authorities circulating image of clear ‘toner’ cartridge with wires