You might have thrown your stimulus check in the trash
You might want to start paying closer attention to your junk mail.

Economic impact payments, better known as stimulus checks, began going out to qualifying individuals and families months ago to help them through the COVID-19 pandemic, but some people still haven't gotten theirs yet. The government was supposed to send paper checks to those it didn't have bank account information for, but some of these individuals received prepaid debit cards instead. And that's where the trouble starts.
These debit cards don't bear any outward sign that they come from the federal government, and the envelopes they arrive in are plain, presumably to deter thieves from identifying and stealing them as easily. But if you're not reading your mail carefully, it's all too easy to assume it's just another piece of junk mail and throw it away.