If your Estoppel hasn't been filed by Monday I would suggest you call the Bankruptcy Court and ask the Clerk about the delay. I did that in a Lehman Case filing and the Clerk brought up my Objection and filed it that day.
Here is the Address and Phone Number for the Court Clerks.
Address: 824 North Market Street 3rd Floor Wilmington, Delaware 19801 302-252-2900
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