Copies of your medical records are probably not allowable expenses.
When you enrolled in the FSA and got the credit card, you probably agreed to submit proof of expenses. And there is probably a date by which those reimbursements need to be submitted. It may be the case that, when the FSA is administered by the insurance company, the information gets automatically transferred across company offices. But unless your plan says "you don't need to submit receipts because we will get the info on our own" then you are probably stuck on this one. You assumed that because some expenses did not require proof that all expenses would not require proof, and that may have been a mistake. Read your plan documents, agreement to use the credit card, and other terms and conditions carefully.
