Worked for me. But I discovered on my own. Had the dogtags yesterday, pressed "Exchange" for fun and it game me an error.
Tried it today and got 410 million GP.
Think what you want, I'm not posting proof, because GMs said they will be looking for images, videos etc
I've spent about 6 million and I realized opening GP crates is the most boring way to spend your time on CF.
I'm going for the coupons (don't really care about the GP guns)
EDIT: Nvm - money is gone. But I still have my items (crates, bags, C4/Nade)