You can post photos of your cats, and change them as you wish. (cfa.org)
If you can demonstrate evidence of ownership (vet records, microchip details, adoption papers, photos of the cat for example) that may be enough to resolve the issue. (cats.org.uk)
Each time we go, I make promises to myself to post about my daily experiences while volunteering and to take lots of photos of the cats. (greatkittyrescuestory.com)