Yes, but as Mr Bollinger indicated, there are limited consequences for not doing so. Why are you trying to find the debtors? ANY act to attempt to collect a debt could be seen as a violation of the automatic stay, so you should be careful about that.
Yes the rules require the debtor to notify the court of any change of address, even though the rules do not get strictly enforced. If you are certain the debtor has moved, you could challenge the bankruptcy but the costs of filing such a Motion, with the filing fee and attorneys fees, will be at least $6-700.
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My question is.why are you asking? If you are a Creditor talk to the attorney. If you are a debtor you want to keep the court and your attorney informed until your case closes.
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As several others have noted, there likely isn't any reason for you to be keeping tabs on their physical whereabouts at this point. Whatever you need to do can likely be done through the court, and notice in all federal cases is provided electronically to the parties or attorneys, so their physical address shouldn't really be an issue.
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