I was looking through an archives book I picked up the other day and I came across this photo. To me it looks like the mpp label is still on tge saber. It’s on page 293,I can only take a photo of it so if someone has a better photo please post
Not exactly the same picture but certainly the same surroundings aboard Vader's ship :
Picture courtesy Lucasfilm Ltd.
You can clearly see the port hole with the additional electrical wires attached inside I only have a very small picture of the aforementioned picture/scene :