This is a big warning thanks to X20 Toys who have pointed out that fake MP Lambor (Sideswipes) have been spotted on the market, which they are also selling themselves. The toys, and it's box, does have some differences to the original figure with the differences being highlighted in a selection of images which you can find below.
The KO's box has a smaller "star-burst" effect (see the images below)
The second difference is with the colour of the red plastic which has been used. The K/O is a slightly lighter shade as shown in this next image.
The next difference to look for is a dark paint application around the headlights which is missing from the knock-off version.
The head sculpt uses the new TigerTracks sculpt which pretty much confirms that it was QA rejects which have been reverse engineed to make this K/O
Another difference with the box, is the hologram which is different as you can see from the image below.
Finally, and this one is for the retailers, the figures are being sold in fake mailers, however these are horizontally stacked rather than vertically
X20 Toys have also given some additional information on the figure which is selling for just under $40 saying that the figure will be released at the end of July 2013 and that the plastic will be a cheaper / lighter quality compared to the TakaraTomy version.
We here at Transformers At The Moon encourage everyone to keep an eye out for these figures being passed off as official and also warn everyone to expect to see K/O versons of Alert (Red Alert) also hitting the market later as well as TigerTracks and possible other recolours in the future if this K/O proves popular.