My first one came in a nice new double box, from TEquipment. I had to return it under seller's warranty due to a hardware glitch. TEquipment wanted me to send it back to them inside another even larger box. (UPS "delivered" this one by tossing it onto the porch of the _vacant house_ next door, even though "Signature required" was indicated by the shipper.)
The replacement from TEquipment came in just the single box, and had a serial number that was smaller (earlier) than the one I sent back to them, by quite a bit. Ironic, since I had waited through their out-of-stock and west-coast dockworker's strike for the first one-- ordered in February 2015 and delivered in April. (This one was sent "second day air" and after waiting all day the second day I finally saw the UPS truck down the block at about 10:30 pm, and I had to run him down before he delivered it to some random location once again.)
Then when Rigol USA offered to replace the one that had Boot Version 0.0.1.2 with the later Boot Version 0.0.1.3, again it arrived in a single box from Rigol USA. BUT... this box had some extra shipping labels still on it: It had first gone to some purchaser in Arkansas, then got returned to Rigol USA, and finally got sent to me.
It did get delivered properly by UPS that time though.