how you help me now?,view photo...
It does seem you were trying to explain the missing capacitor was on the back of a used memory chip and caps were missing on the unused memory chip location as pointed out by
@KrazyT so it's understandable why you would ask why when asked for a pic but people didn't understand your explanation before hand and like myself probably didn't notice the other missing caps as shown by
@KrazyT. Just some misunderstanding.
TLDR Either go with it missing or put a new one there if not resolved by manufacturer for peace of mind but take into account probable warranty loss.
What to do? Well IMHO wait for a response to your email.
Is there warranty on your card? If you have it will the manufacturer replace the card?
In case there is no resolve with the manufacturer then that capacitor looks like it was meant to be there but board seems to be working without it so if you are okay with that then forget about it. If your not okay with it then add it yourself if you have good soldering skills but take responsibility for probable loss of warranty if you have one.
If you do go ahead and add the capacitor it might be interesting to overclock and stress the memory to the point just before instability before hand and then do the same after adding the capacitor to see if there is any difference.
I've had a large decoupling capacitor go short on an SSD, removed it rather than replace it and it's worked seemingly fine for years afterward. I also had a high end MOSFET go short on a Z97 board killing the CPU with 12V. I removed that MOSFET without replacing it and the board appears to boot and run fine without it! I would imagine the regulation would look pretty bad but don't have gear to look at it. IOW just because something seems to run fine doesn't necessarily mean it is fine. Perhaps your missing capacitor isn't an operational problem but it wasn't meant to be put there just for laughs.
Hope that helps.