I just posting this info from Washington State thread,
userName ----------Case#----------RegionalOffice Received Date
---------------------------------------------------------------
ljzm ----------------- 09576xxx - 12/29/2003
gparappuram------ 09578xxx - 02/17/2004
jayjo7 -------------- 09580xxx - 04/12/2004
It looks like there is approx of 2000 cases in between, i guess these numbers are all for in series for all Seattle Region states i.e. AK, ID,OR and WA.
Please post your number and Date regional office received that way we can have a guess or track where the processing are