An update. This morning I finally used a blade from my new, recent order. That means my original purchase really did last me almost exactly two full years, an average of a blade per month. That is crazy!
The new handle came with a 4-blade razor attached. I'll use that one first, then transition into the three-blade box itself. This box should last through my first full year of retirement! Incredible.
Arguing on the internet is like wrestling pigs. You both get dirty and the pig likes it.