Just picked these up from the post office. Complete set in great condition. Thought I had a great deal when I checked the serial but when I took close-ups I could see another faint serial number under the X-Metal logo. Looking at the box, could it be that they are 3rd gen? (according to o-review there was only 1st & 2nd gen). The bottom line shows the SKU followed by B01881. The fact that the box label has a barcode maybe suggests that they are later? Perhaps the gurus could shed some light? Also picked this up at the same time just need an x-metal frame now!!