The URL for a search on staples.com has changed. Searching for "!staples cats dogs" results in a URL like this being generate by Kagi:
https://www.staples.com/office/supplies/StaplesSearch?searchkey=cats+dogs&storeId=10001&catalogId=10051&langId=-1&fromUrl=home
which brings you to a Tomcat 404 error on the Staples site.
I expected to see a search on the staples.com site.
The correct URL for this search is:
https://www.staples.com/cats+dogs/directory_cats%2520dogs
