It depends. If the amount was through a flexible spending account (FSA) provided by your employer it should be in Box 10 of your W-2 as you indicate. If the employer did not have the appropriate plan, then the $5,000 they provided could be taxable compensation. If this is the case it would be included in box 1,3, and 5. Double check your pay statements to see if you actually did receive tax free treatment of this benefit or if it was part of your taxable compensation.
If it is part of your taxable compensation, then you should proceed with the return taking the Child and Dependent Care credit.
If it was provided to you tax free and not included in the box 1,3 and 5, then you should create a substitute W-2 and add this amount to Box 10. This will require you to mail and file by paper.
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