I shall give you my sincere advice:
First, to set fire to their synagogues or schools and to bury and cover with dirt whatever will not burn, so that no man will ever again see a stone or cinder of them. This is to be done in honor of our Lord and of Christendom, so that God might see that we are Christians, and do not condone or knowingly tolerate such public lying, cursing, and blaspheming of his Son and of his Christians. For whatever we tolerated in the past unknowingly_and I myself was unaware of it_will be pardoned by God. But if we, now that we are informed, were to protect and shield such a house for the Jews, existing right before our very nose, in which they lie about,blaspheme, curse, vilify, and defame Christ and us (as was heard above), it would be the same as if we were doing all this and even worse ourselves, as we very well know.
The above quote is one you'll typically find being associated with the motivation of Mein Kampf.
Can you find it in the Concordia version I found? No? Me neither. Maybe it's been left out of the copy on the Internet. Maybe it was never in the LCMS' version. There is no copy on the LCMS.org site to refer to.
The "Colchester Collection" pdf doesn't specify a publication/translation date.
Again, the LCMS has the resources, and I think the responsibility, to document the differences between the versions that are available and being quoted ON THE INTERNET.
Then contact them, I'm sure they'll get right on it.