rereading post 14 in the linked thread, falgrunt posted Mauser corp adverts from the time, those clearly say refinished parts & new stock. The wood is probably the easiest to remake, as others are still making replacement stocks for K98ks. Have you tried to get any info from Mauser themselves? or whoever is “Mauser USA”? Seems like they may have some info on total number made, where distributed, serial number range. (though, when I tried to get some machine tool drawings for an ID hone built in 1988 near Hannover in 2014, I was told that they’d been destroyed in a flood, no digital copies made, as it was a one off custom, & low priority for preservation of records)
Folks here know a very great deal about the historic rifles, not as much about more modern iterations.