Why can't you say it if you can't show it? Say I didn't have a camera. Would you not have wanted me to say something like "I made a Luigi sprite on top of a ? block sprite out of legos. I don't have a camera, but I'll post a picture later."?
Well, yeah, if you said "I have every Mario game ever made" we'd want photographic evidence... and if you said "I have every Mario game in existence but I don't have a camera," I'm not sure I'd believe it. But "I made a Luigi sprite out of legos, but no camera" is pretty believable.