I think the appropriate response for an able-bodied(ish) person is still to help. Like this maybe.

"But it's blocking the kerb cut. That's no good! Let me help, I'll make you a new ramp. This sign will do, I think." *use sign as ramp* "Hmm, that chair looks heavy, though, better make sure it'll be safe." *jump up and down on sign until it breaks* "Whoops. That's no good. Still, now that I think about it, the kerb cut is clear now, so you should be fine. I'll just take this sign to the owners and explain that it appears to have been accidentally damaged due to blocking path access. Tragic."