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The most important one is the First Date to Use and the Last Date to Use. These two dates are defined as the times that you are allowed to use the checks and when they expire. If the Last Date to Use has passed with the check unused, return it to your local WIC office or destroy it.
What Else May Suffice. Credit card statements may be used to prove purchases if receipts are not available. The IRS may also accept canceled checks as proof of expenses. However, canceled checks must be accompanied by another form of proof, such as your business journal or other receipts you may have for that time period.