Both of my 475's had this issue... and I've noticed others have it as well. They are missing the little screw-ins (is there a real name for them?) for the DB-15 cable. A minor annoyance, but annoyance none-the-less.

If you have an LC donor board, you are in luck. You've got 4 screw-ins to use. Just unscrew them... and since they won't screw into the LC475 cause the hole isn't threaded, get yourself a baggie of #4-40 machine screw nuts (12 for a buck or so). Then you are in business. EZ Peezy.