Returned FSA items a year ago before knowing it was fraud

Hi all, first post here, but long front page reader. I read on slickdeals a while back that people were returning FSA items for cash. It was not condemned in the posts I read. I just found out that doing so qualifies as fraud. However, I spent all of the cash I received and more on FSA eligible items that I did not request for reimbursement but have all of the receipts. I returned items for $1500 cash a year ago following the advice found here from senior slickdeals members:

http://archive.slickdeals.net/f/1...SA-balance

My FSA plan is company paid for so they let you reimburse items up to a certain annual limit. I do not have to contribute to this account nor does it count as W2 income. I also do not believe we use a 3rd party admin.

Am I in danger if my company finds out? If they do find out what do I say? It's too late to come clean now too as I am leaving in 3 months for a new job. Just worried about fraud, theft, etc when it was all a misunderstanding and I used all of the return money and more on other medical items. Just have this on my conscience

Thanks slickdeals