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Go to the source. Amex chat. See what your options are. Just tell them the card is redundant because of the MR/skypesos link on your PRG
I opened mine ($5k) in December 2014 and closed it September 2015.
I never used it... I did get the free trip from the mileage bonus but beyond that the card didn't get used after I stopped going to Costco in favor of Sam's Club... after getting that MC last March.
I'll surely pick up another AmEx one day... but as of today AmEx products just aren't on the top of my priority list.