We may be beating this point to death, but as I understand it, the previous PB was on the syndicated version, and the show considers that a separate set of records, not to mention that the nighttime show never had a DSW rule - so this is, in fact, the first time there's been a perfect bid on the CBS version, as well as the first time that a PB has resulted in a DSW.
It's also possible that since Roger-the-Institutional-Memory is gone, no one currently working on the show actually has any accurate idea whether it's happened before. Even if a lot of Roger's on-air answers to Bob's "How many times has this happened?" were made up on the spot, the fact is that Roger would have known where to find the accurate answer if he wanted to, and I'm not sure anyone there now does (knows, or wants to). The current personnel may not care about the difference between "This hasn't happened since I've been working here" and "This has never happened."
After thinking about this for a couple of days...y'know, even if there had been something fishy (and there clearly wasn't), all this really cost the show was an extra daytime Showcase of about $30,000. Roughly the same amount as the free Plinko money given away because of the staging error earlier this season. I wonder why there's such a furor about cheating/rigging/S&P now, and not when two people won $1 million each on the MDS's with less accurate bids.
John