<human>: Provide a brief overview of the text.

I've only within the last 6 months moved into a new home which has carpeted stairs. My last home did not have any carpet in the home, but I've lived in homes previously without issue. I've had my cat from an 8 week kitten and he's now 12 years with all his claws. As long as we had one of those cardboard boxes around, he would scratch on those; we've also had posts that he would occasionally scratch on. For some reason this new home, no matter where we move his scratching box, he wants to scratch the stairs; primarily the bottom-most step, but also sometimes the top-most. It's a split staircase with a small landing about half-way down, I've tried putting the box there as a middle ground, and I've also tried having the box sitting at the bottom step. I had read there could be a marking issue due to having another cat, but we've also had other cats in the past (this current one included) and he didn't have this behavior then either. So, apart from needing to find a new floor covering for my steps, I'm wondering if there's any other ideas as to how to make him stop. Thanks!
<bot>: Cat previously left carpeted steps alone, and now won't stop scratching our stairs when usual scratching mechanisms are in place. How to fix without replacing stairs?