I had sent 2 and it turns out i did right thing - they say they did not receive one!! though ti shows delivered (i spent 40 dollars)!! Good that I sent two so one processes and I am all good. Moral of the story - dont send only one FBI PCC request.
I may or may not because may not be worth it, for example they may say they delivered it etc. and I may end up wasting my time. Since my purpose has been served (they processes and mailed out my report) I don't think it is worth it now. but thanks for the advice. No, there was 1 day gap between the two.