My RFE was also pretty fast (less than one day). According to my RFE letter
(the IO asked to provide more documents for my contribution), I do not think
the IO did not go through the petition letter and exhibits (although I do
think the IO did not read them in details).
Please wait for the mailed RFE letter from the USCIS. You need to attach
that letter when you send your RFE response back to the USCIS.
GOOD LUCK~~~