I expect to find more with the simplex, like this token i had missed for years. I am getting to know it at the moment and will continue to prove no permission is fully pounded.
The house I grew up in was historic to our town, and my parents owned it for a little over 40 years. The yard was about a quarter of a city block, and I searched every inch of it over and over every year for about 31 years. I used different machines and searched it in different weather and soil conditions and different paths of approach using different sweep speeds and machine modes. Every year I always found something I had missed before.