Hi Mike
First thanks much for posting the picture and link. I had seen the photo before but you spotted something I had never noticed, the camouflage,
this style I think was called Micky Mouse Ears. Here is a slightly better source picture.
What you spotted brings out a very interesting point though not all the units had camouflage paint. Recording Unit 4 which seems to have been the most photographed doesn't.
The second photo of Recording Unit 4 shows it before the signage had been paint on the rear.
As a result of your spotting this though I started looking through sources here is a picture
of the side of one of the Recording Units number unknown, that has camouflage maybe the same Unit as in the photo you spotted.
Again thanks for posting the picture and link to the CBC page I'll have to update
my web page to include the new information you found.
Cheers Phil