FSA question: I signed up for a $1800 FSA. I received full reimbursement. I only contributed $1,500.00 (terminated). SHOULD MY W-2 STATEMENT SHOW $1800 OR $1500?

I need to know if my W-2 needs to reflect the actual FSA CONTRIBUTIONS I made- or if it should reflect the FSA REIMBURSEMENTS made to me (which was my FULL ENROLLMENT AMOUNT).