It's not that uncommon to find Lugers with the sideplate removed and hidden as a safety effort...
Don't let anyone touch your Luger unless they have experience fitting parts and know the mechanism well. Your gunsmith apparently has no background working with them. Most gunsmiths will not tell you what they don't know.
You can get a replacement side plate, but it must be fitted to work properly. That fitting task takes experience. Tom Heller on this board is a gunsmith with that experience. I'm sure there are others, but be sure before you let them work on it.
Had you let your gunsmith continue, you'd be looking for a sear bar too...
In 1936, these Mauser made Lugers were finished by rust bluing and several small parts strawed.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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