I don't have a pair to compare to but in my other hobby of cologne, you get a lot of counterfeits of expensive frags like Creeds and Tom Fords. They usually have several things in common
1. Look for spelling or grammar mistakes on the outer box. Check the edges of text to make sure it's sharp. Silk screening should raise a bump slightly where you touch it and it should not flake off with a light scratch from a fingernail.
2. If the instructions are in a different language that doesn't usually mean much. Sometimes they sell them very cheaply because they are grey market, destined for a foreign market like Dubai, but they are cheaper in Dubai than here, so somebody buys up the stock and sells them on ebay. You get the real deal, just no warranty.
3. Check the stitching! Anything that has stitching on it, like the edges of the pleather ear pads, the stitches should be consistent, evenly spaced, and the seams should be finished, not uneven and jaggedly cut.
4. If you take the earpad cover off and pop a driver out you can get the part number of it without having to desolder anything. Look that part number up or compare with another owner.
Some of the ways I've spotted fake Sony MDR-V6's.
1. The silken material that lines the box is glued haphazardly without a smooth seam at the edges.
2. The SONY logo and checkerbox pattern where it says "Digital" has rough edges and looks inconsistent, the boxes look blurry and misaligned instead of razor sharp and perfectly spaced and aligned.
3. The headband covering bunches up when the headphones are taken off and allowed to clamp on themselves. The real Sony's had a wrinkle free headband whether it was on or off your head.
4. The SONY logo on the bag should be raised up from the silk screening and you can feel it with your finger tips.
5. The headphone length adjustments have numbers and notches that don't line up on fakes but do on the real hardware.
Sorry I can't tell you anything specific for your phones. Good luck.