I agree with Samuel. The filing fee is $405 to seek a duplicate copy or seek further processing on an approval notice.
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To find out the fee on any immigration form, visit the USCIS website at the link below. A direct link to the I-824 is also provided. As the other attorneys stated, the fee is $405.
You can go directly to the USCIS website for any form by visiting uscis dot gov forwardslash lowercase starting letter dash form number.
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The fee for an I-824 is $405. Whether you actually need to file one, however, will depend on the specific facts of your case. Just because you didn't receive a receipt or approval notices doesn't necessarily mean that you need to obtain a duplicate.
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