I am relatively new - have been sending in since May (busted open my collection from 30-40 years ago).
Anyway, I have 9 orders that were officially received/entered starting on 7/30.
Interestingly, none of them have moved beyond SFG, but the 4 most recent items received are shown in the photo - they were all mailed around 8/26-9/5.
Definitely not FIFO - and these aren't even express orders - they are Modern (and not even fast-tracked). One was received on 10/4 and shipped back on 10/6 - I'll have it by next week.: