I mean, Lois remembers the gouge in the bannister now because it probably didn't happen very long ago. But that isn't the sort of detail that she would pass on to her kids and grandkids, and hence to Utopia.
Isn't the gouge there because they are actually AT the Dailey Planet that's been converted to a musuem, Right? Granted, it might be worn even further now, (bout 200 years worth)...
Just a thought.
TEEEEEEJ