BBM.....2 Cents......
That is a very good theory! My take on your theory is that the Wagner's did purchase BPV's and wore them during the murders but then disposed of them.
Then as you said, they were afraid evidence would come out showing those vests were purchased by them so they bought 2 "fake" vests to create a "fake" paper trail. Throw those vests in and it's like a red herring.
In that case, they deliberately planted those 2 vests in Billy's bathroom and inserted different plates inside that showed dates after April 22nd.
Seriously, they knew they were being questioned which means they must have known they were in jeopardy of being searched, so why deliberately leave 2 vests where they will be discovered? Answer, because they wanted them to be discovered. If they did not want LE to find the vests, LE would not have found them.
Canepa said there is more to the indictment than Owen is revealing. She said you have to look at the 4 corners of the indictment. In other words, it's not as simple as he makes it out to be, it's not simply that Fred forgot she bought them on eBay rather than Amazon.
Owen seems pretty desperate to get potential jurors to believe the State is wasting it's time prosecuting an innocent matriarch. And it is working somewhat. I've read all over SM people's opinions that the State is railroading an innocent grandmother because they really don't have enough evidence to try her family..