Using the links in that 30th March archive I see that the Chester FF thread was thread #171134 which was not archived.

If I search in google using
cache:https://mudcat.org/thread.cfm?threadid=171134
I see that the thread number was reused on 12th April by Shanty Session, London, UK and that has has since been cached. I know of no way to get at earlier google cached varsions.

Perhaps after a restore the thread numbers shouldn't be reused, if that's feasible.