Is there any unique markings on either the device or the packaging that would indicate when they were possibly shipped?
I don't seeing anything on my docks to indicate that. The only unique number than serial, mac, etc. is there is something next to the bar code sticker on the box that says "LOT NO:" The first dock I bought reads, "lot no: 1543" whereas the new dock I bought reads, "lot no: 1541"
Maybe that means the shipment lot the docks were included in. I was banking on the possibility that the faulty docks came from the first batches of docks that shipped and maybe docks from a newer batch were good.
I pre-ordered the Surface Book and dock within minutes of the press conference announcing it. So I received my dock on Sept. 25, one day before the first Surface Books were received by customers.
My lot number is 1541. So it looks like the replacement dock you received is old, maybe among the first docks that shipped.
As noted above, my dock works like ****--issues with the display, mouse, keyboard, and especially the ethernet port.