http://www.guardian.co.uk/travel/2012/sep/28/museum-of-brands-london-emma-kennedy has an article on the Museum of Brands, Packaging and Advertising:
I spy a Toblerone packet from the early 1930s and am amazed that it looks no different from the ones in the shops today.
"Albert Einstein was working in the Patent Office when the patent for Toblerone came in," Neil tells me. "We don't know for certain but it's not impossible that it was Einstein who approved it."
However, Einstein’s specialty was electromechanical devices, so it seems unlikely.