I had a rod Bayonet 1903 that had been put together with original parts using an original and unused Field Replacement stock on it. The stock had never been used on a rifle. It Did have a band retaining spring, but no bushing for a rear trigger guard screw. Maybe the company armoror was supposed to add these, I don’t know. The stock had no Inspectors or Proof stamps, but it did have three small ones on the wrist by the stock inspector.
What I’m saying is that it’s possible somebody got ahold of an unused, field replacement original 92 stock and used it.