Matching an original magazine to a Luger is very difficult. It is not impossible, and this forum has helped accomplish this in the past. It is very rare to actually do this.
You may find a period correct magazine which was numbered to another pistol, or an unnumbered period correct replacement magazine. These were part of armorer's replacement parts kits and were marked with a small "42" concealment code for Mauser.
Documenting a Luger to a specific location of battle is close to impossible.
Weapon assignments were documented on individual soldier identity records which were scattered with their serving units, and those documents as well as their individual identity cards are hard to find. The task would be to associate an individual serving soldier with a battle and then locate their identity records.
Everything else is anecdotal.
You may find our forum FAQ document helpful. Just follow the FAQ link and you can download the PDF free.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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