OK, I was wrong. I had a look for images of the Catlike whisper and it DOES appear to be molded on the older model Whisper but with markings of the Whisper Plus which is a newer model. The rear straps do look different from either the newer or older model but the older model DOES have the strap anchors externally in the same place as the one you have.
You said however that you got it from some Catlike employee's? It well could be a prototype and the Catlike senior staff would really NOT want it being sold. Most manufacturers get VERY annoyed about grey market imports as well and will claim an item is a fake even if it's real but come through the wrong channels.
I don't know. You probably shouldn't have bought it in the first place. Its molded on the original Whisper but marked as a Whisper Plus so it likely is a fake.
Anthony