Yes, it knows which packages belong to you. It will only unlock if the package is being delivered to that specific lock and the package is "out for delivery".
This is probably the biggest roadblock to this product's success. However BoxLock is in talks with all the major carriers to provide training. The carriers themselves are incentivized to use BoxLock because it provides a guarantee that the package was delivered successfully and securely. They don't want packages stolen either.
You can add delivery instructions to most shipments that tells the delivery driver to use BoxLock.
You always remember the successful investments you didn't make, but not the unsuccessful ones. Think of all the money you didn't lose making bad investments.
I just bought a 34" 21x9 ultra wide monitor and am in a similar dilemma. I use ShiftIt (https://github.com/fikovnik/ShiftIt) for window management since I can assign a single keyboard command to center whatever window I’m working on. However, what I’d really like is for command/alt-tab to automatically place the active window in the center, the previous window to the left, and the second-most-recently used window to the right. I might have to contribute to ShiftIt to make it happen, unless someone here knows an app that already does that.