I suggest asking your employer if they have an accountable plan. Just because you are not required to pay money back doesn't mean it's an accountable plan. To be an accountable plan, your employer's reimbursement or allowance arrangement must include all three of the following rules:
You must have paid or incurred expenses that are deductible while performing services as an employee
You must adequately account to your employer for these expenses within a reasonable time period, and
You must return any excess reimbursement or allowance within a reasonable time period
