Still exists.

If u know them can open all their boxes because it's already opened.  My previous unit from Satu Gadget I opened 6 boxes, found 2 no yellow tint.

u sure?

Not sure if really international or not. Cause now the covers came out, so sellers able to buy and change the covers and tell you international? Lol, I'm really not sure. (not accusing or whatsoever, just my opinion)
I know the China box is bigger than the international box: phone box + charger inside, got manual book inside, while international you get 2 items, phone box + charger box.
You can check the bootloader as well, if unlocked = meaning it been used to flash flash before.

He did offered to help me ship back my set when I got the invite to buy the phone. And some forumer here did buy from him.
B-but I no 1+1 to join
Most I can do is help molest molest your phones.

I got my set from teramac. Nice guy but the set that I bought from him was a China set. Not sure if he has international sets already now. Better to cod to check everything. I did cod with him too.

How long did u guys charge yr opo from <5% to 100% ?
Mine when using official charger + usb around 2.5hrs compared to when using mi powerbank which is 1.5 hrs

If you are scared of flashing on yourself better don't buy OPO. Reseller don't clean flash and sell, mine from DirectD and it's not clean flash at all.

Reflashing rom is very easy. Just follow steps and instructions. afaik, a lot people recommend to reflash.