Took them 2 months to reply to my email with a challenge.
"If you are willing to match our Silver Card status, in order to effectively evaluate your flight record, please provide below documents – after you’ve earned 7,500 Status miles (for Silver Card) in Infinity MileageLands accounts in the past three months.
1. A proof of membership card image for your Airlines valid for at least 6 months or more.
2. Mileage statement from past serial 12 months of your Airlines which must contain 30,000 flying miles (as long as the international sectors are also flown by EVA Air).
3. A scanned copy of your name card."
on January 16, 2020