matching luger and holster date fact or fiction

I am unaware of any luger ever being upgraded in value because it had a same-date holster. If I buy a 1939 luger with a 1939 holster I don't recall any collector or seller ever thinking it was worth more than one with a 1942 holster. Where did this concept come from? In general, the only lugers ever mated to a specific holster were police lugers. If I suggested to one of the experienced luger collectors that a holster was "matched" to a luger and asked for a premium, I would be the joke of the show.