I received my second stimulus by mail after I filed my 2020 taxes. Should I amend?

I never received my second stimulus check because my bank account was closed. I filed my taxes at the end of January and I selected that I didn’t get the second stimulus (which, for what it’s worth, didn’t receive full payments on either check because of my dependents). I received a paper stimulus check in my mail on feb 5. So now I’m not sure what I should do, leave my tax return alone and see what happens or should I file an ammended return immediately or is it possible I could get in legal trouble if I cash the check after saying I didn’t get it?
anyway I hope someone has the answer because I’d really like to cash it but I don’t want my tax refund to be badly effected either.