This morning I was reaching for the pull tab to open the tool compartment and get my tire guage when my fingers found these two objects. Note the pencil is for scale, and was actually on my desk, here at work at the time.
They appear to be some kind of rubber feet. They're almost sticky on one side. As I've not had any cargo in weeks, I'm pretty sure they did not fall off anything non-prius in nature. So, then: What are they, and where did they come from?

They appear to be some kind of rubber feet. They're almost sticky on one side. As I've not had any cargo in weeks, I'm pretty sure they did not fall off anything non-prius in nature. So, then: What are they, and where did they come from?