Can any help me track down my second and third stimulus check they were mailed to my old address and ive lost track of them?

First does the IRS have your current address ?    When the checks were returns to the IRS they had no current address to send them to ... so update your address by mailing in form 8822.    https://www.irs.gov/pub/irs-pdf/f8822.pdf

Next ... put a trace on the missing payments :  https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-payment-issued-but-lost-stolen-destroyed-or-not-received