Which doesn't quite match up with what Kettenhund has discovered:
"5. The shop lock matches the house lock, and they do not look new. The manuals for the locks were stored in the shop, and the handwriting in the manuals matches notes MC had hanging on the walls."
Trying to reconcile many discrepancies, it seems as though (as been stated in the past) our VI (the granddaughter) was handed a line of 'something stinky' about a lot of details. Then again, I seem to remember that her source was actually BC or she was hearing info that originated with BC. Remember, in the beginning it was played up that MC & BC had a storybook marriage, match made in heaven, and everything was coming up roses. We were to later learn a whole slew of things that contradicted that. Point is, IF we were deliberately misled about the garage lock situation, whatever could the reason be?