I would be very interested in the scanned copy of the Answer Key you mentioned. Let me know how I can get it from you. If you could maybe post a Dropbox link or something of the like, that would be awesome. Thanks!!!
Kudos for posting your answers!
Now we can compare your version with Rusty Mason's Key, which stops at Ex 425. Can't wait for your answers to the rest of the exercises - 430, 431 ... 734, 736.
Incidentally, I have a scanned copy of the Answer Key (1883) to White's 'First Lessons in Greek', 2nd edition. It provides answers to English-to-Greek exercises. If you want it, let me know.