It sounds like you were reimbursed under an Accountable Plan. If that is correct, you do not need to do anything. According to the IRS:
How you treat reimbursements depends on the arrangement you have with your employer.
There are two basic types of reimbursement arrangements—accountable plans and no-naccountable plans. You can tell the type
of plan you are reimbursed under by the way the reimbursement is reported on your Form W-2.
To be an accountable plan, your employer's reimbursement arrangement must require you to meet all three of the following rules.
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Your expenses must have a business connection. This means your expenses must be deductible under the rules for qualifying
work-related education explained earlier.
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You must adequately account to your employer for your expenses within a reasonable period of time.
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You must return any reimbursement or allowance in excess of the expenses accounted for within a reasonable period of time.
If you are reimbursed under an accountable plan, your employer shouldn't include any reimbursement of income on your Form
W-2, box 1.
Non-accountable Plans
Your employer will combine the amount of any reimbursement or other expense allowance paid to you under a non-accountable plan
with your wages, salary, or other pay and report the total on your Form W-2, box 1.
You can deduct your expenses regardless of whether they are more than, less than, or equal to your reimbursement.
