How do I find my refund status for 2017 and 2018? I mailed them out 03/03/2020. I do not have a house payment, car payment credit card. Refund search is for 2020 only.

You paper filed your returns.   

Unfortunately, the IRS is not currently able to process paper filed returns. 

Paper Tax Returns: All taxpayers should file electronically through their tax preparer, tax software provider or IRS Free File if possible. The IRS is not currently able to process individual paper tax returns. If you already have filed via paper but it has not yet been processed, do not file a second tax return or write to the IRS to inquire about the status of your return or your economic impact payment. Paper returns will be processed   once processing centers are able to reopen. This year, more than 90% of taxpayers have filed electronically. 

IRS Operations During COVID-19