I have a pair of Adidas thanaz. I know they are not the same cut as yours, but there are few noticeable differences.
1. On the waist tag, it has adi-thanaz as the cut.
2. On the coin pocket, one of the rivet it's an Adidas logo. All the other rivets has Adidas on it.
3. On the right thigh outer seam, there are 3 lines representing the Adidas 3 lines like on the tag.
I can't say if yours are legit or not based on photos. But hopefully you can use mine as...