Unless you have a picture of yourself crossing illegally, there is no way you can prove you entered without inspection other than you have been in this country since that point entry and there is no documentation of you entering the country.
Here's what
USCIS says about the check:
Quote:
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We suggest that you use a separate check or money order for each application in the package and biometric fees. If a single check is submitted for multiple applications and one of the applications must be rejected, then all applications will be rejected. The Lockbox can not accept overpayment and make partial refunds.
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From my understanding we are only paying for one application (i-765) and biometric fee, so it would only be one check.