IRS – Where’s by refund?:
https://sa.www4.irs.gov/wmr/

IRS – Create my account:
https://www.irs.gov/your-account

Nebraska Dept. of Revenue – Where’s my refund?
https://ndr-refundstatus.ne.gov/refundstatus/index.xhtml

Nebraska Unclaimed Property: https://nebraskalostcash.nebraska.gov/