Sorry, it was me, ... Won't happen again.
As mentioned before, they are most likely persimmon seeds. There are gobs of them all over eastern Texas. They are scrubby little trees that grow to about 20-30 feet and produce lots of ORANGE-colored fruit this time of year.I'm not aware of anything that looks similar. It could easily have come from garbage as my neighbor seems to deposit food stuff in a pile near his house.
The shape and size is familiar enough to me. I've seen it elsewhere many times, though it's generally much darker and lacking seeds but typically has hair in it.
I'm not sure about my location here, but there are ringtail cats in TX. I'd think that would be rather large for them as they are the size of a very large squirrel.