Here is a part of the answer from Allan Sutton's blog post.
Given the money and necessary permissions you can certainly make records from old metal parts if they are still in decent condition.
From: Association for Recorded Sound Discussion List <[log in to unmask]> On Behalf Of ERIC BYRON
Sent: Monday, April 5, 2021 6:29 PM
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Subject: [ARSCLIST] [78-L] What happened to Columbia's masters and the masters from some of the other companies? Could they still be used?
I know many of Victor's masters were destroyed when Victor demolishedits Camden warehouse. Does anybody know what happened to Columbia'smasters and the masters from some of the other companies? If these masterswere found, would it still be possible to make recordings from them?