There's two super early mg42's in the pile of 34's in pic 2.....
!!!
Those GIs are CLEANING those weapons...why?? That pic looks too ordered to be trophy hunters giving their new acquisitions some love, and only the soldiers in the last two pics have any unit/divisional insignia on their uniforms. That brings up a number of questions beyond the obvious, but offers at least an additional scenario for explaining bolt-only mismatches.
Pat
They probably cleaned, oiled and placed them in storage so they could be reissued to our allies ie; Free French troops or shipped to China [ Chinese were using 8mm Mausers as their standard rifle ] or even sent to the USSR.