Here is what you do. Order more of the same part. Then contact Marco and tell them the part(s) were defective. When they ask for pictures send them pictures of the defective ones from 3 years ago. Keep the new ones and return the defective ones for replacement. Now you have twice as many you need and they were essentially free. It's not like these things have serial numbers on them.
Don't let honesty or morals get in your way!
[Note1: If you read this and thought "Hey, that's a great idea" then you should really quit pinball and become a politician, or lobbyist]
[Note2: For those that don't know me, I wrote this as a joke. Though I know this method of "returns" happens all the time in retail]