That is why mail should always be with a tracking service or certified mail with return receipt. That is your only proof of receipt.
However, amending before the first was fully processed and you received any refund due was a great mistake. Having two returns in the system at the same time red-flags them both for hand processing. And with the COVID backlog that can take a year or more. Adding a 3rd return can compound the delay.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
