I stopped to pick some berries for my walk to the library today. My neighbor happened to be outside. I showed her the berries I’ve been trying to ID, and she thought they were likely boysenberries given what had been here prior. I offered one to her to taste, and she confirmed her thinking.
When my partner and I did our walk around just now, we found a few more ready to be picked. He’s had boysenberries before (I had not), and when he tried them he also said they tasted like boysenberries to him.
I’m adding them our list.