My fears are over!
Update to my previous post:
Even though my card is suspended due to the financial review, the US Mint charge still went through. I was told all charges would be denied, but I guess it went through since it was pre-authorized before the freeze on the account.
Got over $3,000 of coins yesterday and got rid of them all today. Spent some at the post office to get stamps and got a money order. Also went to Walmart and got a $1,000 money order. No problems! Everyone seemed happy to get them, no weird looks, and no one wanted to unroll them and count them.
Wheeeww!