I am currently short 33 Micro Ether contracts (a nominal value of a whopping $5,104) but haven't gotten anything from the CFTC.Actually my first thought was this must be in error so I wrote this afternoon to the CFTC asking for more information and got a prompt response. If you want to know what is required to become a major player with the CFTC go trade micro-ether futures, the trigger for being classified as a "large trader" is 25 contracts (= 2.5 regular ether futures contracts). I recall a previous discussion about why we shouldn't trade illiquid micro-contracts if we can avoid them. Here seems to be another one.
I did however get one of these requests from the CFTC in the past because I had a position in a futures contract that had been on the CFTC's approved list but was subsequently removed and I hadn't closed it out yet. I filed the report and that was that. (Funny thing though is that I had to call IB to close out the position because US customers weren't allowed to trade it.)
Perhaps because I already filed that first report I don't have to do so again since IB just sends my reportable position to the CFTC for me, who already has that earlier report with my information.