So I finally got my Sivga SV007 issue sorted out, and bottom line is I got a brand new pair.
I have to say, this is a very impressive sounding headphone. Looks good, impressive soundstage, and comfortable to wear (but I did have to loosen the clamp by bending the headband). The stock cable looks like something that came from a dollar store headphone, so I recommend changing that to something better.
Also, I wasn't completely sold with the sound of the fenestrated ear pads out of the box (ie perforated with holes). I mean, they are comfy and were a bit cooler than non-fenestrated ear pads. But the sound seems a bit thin and not full-bodied. The mids have a touch of hollowness that was a little off-putting.
I tried some normal pleather pads (ie not fenestrated), and
boom the sound is very full-bodied, bass increased slightly, and the mids sounded much better. I may try out the stock pads again, but for now the regular pleather pads are staying.
Also, there was an odd distortion/vibration on the left side. I naturally assumed that the driver had some problem and the headphones were defective. To my surprise, when I pulled off the pads and looked, there was a small scrap of cotton tuning paper sitting on the driver diaphragm (in other words, the same tuning paper used to tune the vents on the rear of the driver). I lifted up the nylon mesh covering the driver, and carefully removed the debris with tweezers. All of the games of "Operation" I played as a kid finally paid off, as I had a steady hand and removed it perfectly without touching the fragile diaphragm! I then put everything back together and everything sounded perfect. So the lesson is to always check over your gear after receiving it. You never know what kind of QC issues you'll find!
Unfortunately my digital camera had a malfunction, and didn't record any of the photos to the memory card. So I have no photos of the paper debris, so you'll just have to use your imagination
If you have a chance to pick up a pair of these open-backed wooden beauties, do so!