You got a good price on the razor and a bit of case thrown in. What a shame about the case, but now if you ever find a good case without the blade vaults, your good to go!
Yeah those cases, in good condition, are being listed frequently on the big auction site with totally unrelated razors in them (sometimes Gem 1912's, sometimes a random Gillette). You should be able to get one at a good price, because it seems fewer people bother to bid on mismatched sets. Don't lose those blade vaults. Those are the items hardest to find.
I love my Micromatic OC. It keeps me light handed as its pretty aggressive. I bought mine at a flea market as well. You gotta a killer razor for a killer deal!