Der vaultmeister…

…is of course herr joe travers, aka the bucket and mop meister. So are there any clues to be found as to whether this is a mysterious misnomer, or an appropriate appelation ? In what is almost an eerie interview, there are some indications that this is not restricted to assigning new safe combinations, with a view to ensuring security of the vault. Also, one of the pages at united mutations has more on vaultmeisterly duties.