Kirby (shelter adopted) started to do some "rapid bursts of running" which I now know are happy bunny 500s in his pen after a few days. He didn't binky til about 2 weeks later. My husband saw him do it first. He said to me "Helen... Kirby is hopping irregularly!!! What's wrong with him?" lol
Toby (pet store bought as a baby) was binkying pretty much as soon as he hit the floor of my home. He's just always thrilled by stuff.
Some bunnies binky more than others. Some bunnies express their joy in other ways, like lying down in a melted "pancake", flopping over, "dead bunny flops", making noises, running around... binky is just one expression!