Medical check from USCG

I am in the process of filling out my application for my third mates license. I took Adderall briefly to see if it would help. I did not like it so I stopped taking it. I was wondering if I dont list it on my medical form would they find out about it? I paid for my doctor visits out of pocket but used my insurance to pay for the adderall. Will they check you expenses in your background check?
Thanks,
Jack

They didn’t check mine.