First, because some people have asked, from having 2 different receipt numbers I think that each receipt number (eg IOE09180) represents 1 week of receipt dates. This is because my 2 receipt numbers were submitted 15.5 weeks apart and are 15 numbers apart. I've been using the 1 week assumption when I review the data.
Second, does anyone know which form types are included in the IOE09 processing lot? E.g., I filed an I-485 due to my marriage to a US citizen. Would people filing for OPT or asylum also be included in these charts? Information on what it covers would be intriguing as I realize patterns probably vary depending on who is filing