A 1992 Phillips Auction had an almost complete set of Fourth Bureau Issue FDCs, all addressed to Fred R. Schmalzriedt of Detroit, MI. Included was a Hayes FDC. Out of curiosity, I requested photocopies of the covers. An investigation showed me that in every case, the postmarks and frankings on the Schmalzriedt covers were identical to known Worden covers of the same issues. It was obvious that the Schmalzriedt covers were either serviced by Worden on the First Day or had their addressing done at a later date on unaddressed covers.
Schmalzriedt was another member of the Michigan Stamp Club. Even though some of its members received Fremont FDCs, none are known addressed to Schmalzriedt.