Reddit – Dive into something

Some attention-grabbing Xbox Prototype Controllers from a earlier MS design/tester. They appear to work as regular or is there something particular that makes them completely different than regular releases? Inside controller battery ports marked as PROTOTYPE and a few of them appear to have coloration/design variances from retail releases. Are these more durable to seek out as I found so little info on-line about a few of these. Maybe they’re normally destroyed after testing/design section?