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Do you mean Sep 25th, since you mention that you got a receipt on Oct 06? I think the INS has not been issueing receipts for I-140 redo petitions filed during the second half of Oct, 2000. I sent mine in on Oct 20 (the INS received it on Oct 21, sat) and I still have no receipt. The RFE has not been acknowledged by the AVR system either....
If it is Sep, please call them up and make sure they treat it as an amended one and not as a new one, since I know of (atleast) one instance where the INS treated it as a new petition, and that too around the same time-frame as yours.