I think you just have to randomly click around for those bunnies. I went back and, with my 10 year old son standing next to me and "helping", I asked him which shop has a cool sounding name and after only the second name he said, I found another bonus bunny. I was going to set my watch and time how fast they come. I wonder if they are more likely to appear now, around dinnertime (here on the west coast). If you are like me, you have probably invested a few hours in this endeavor, so you might as well spend another 30 minutes to find your last bonus bunny! Good Luck!