Mr. Tahir is correct concerning keeping it an extra day or 2. The real problem is you now may flip into a daily rate. The rental car company won't report it missing for at least 5 days, however they will be looking for you.
Of course
From my extensive car renting experience with many car rental companies you shouldn't need to call them if it will be just an extra day but make sure you understand the extra day fees and charges may be more than the current rates
Yes
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