The allegations are already out. Threatening everybody won't change that. On the contrary it sounds like they actually have something to hide.
Galax PR training course, Scenario 63:
hypothetical user: Hey there are some marks on this GPU like it has been used before!
Optional response 1:
We thoroughly test all our cards that's why there are marks on it, and if any one of you fools ever mention this again we sue your donkey off!
Optional response 2:
We are sorry, you got a card that was probably randomly selected for in house testing, we apologize for any inconvenience, here is a $10 voucher have a nice day!
Congratulations, you choose option1, you loose!