I am really not sure if anyone has posted this before but this is my attempt at showing where the numbers are....

The 3 is the most visible and the 6 is too if you connect a few lines and 'color over a few others)....the middle part is where I think the 5 is and all you have to do is add a line to it and flip it and you have the 5

Here is the awful quaility image I did in paint on finding the numbers that people are always wondering about in this products blog.