If you do not have a Form W-2 then you should not report one (i.e. do not enter a W-2 with all zeros) on your tax return. Reimbursement by an employer for legitimate business expenses (e.g. mileage, office supplies) are not taxable and do not have to be reported.
If you were an employee and incurred out of pocket expenses related to your job, for which you were reimbursed, then why would you not have a W-2? Was this a new job that you started at the end of the year?
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