(NEXSTAR) -- Suddenly received a refund from Amazon, even though you haven't returned anything in a while? You're not alone.

Several Amazon customers said they recently received refunds for purchases they made years ago - 7 years ago, in some cases.

"I track down the order on my account and it's an order I placed a whole seven years ago!" one user wrote on Reddit earlier this month. "Happy to get my $13, but...wow 7 years!"

The post included a screenshot of an email sent from Amazon explaining that the customer was being contacted "about an unresolved product return."

"Following a recent internal review, we identified a very small subset of returns where we issued a refund without the payment completing, or where we could not verify that the correct item had been sent back to us so no refund was issued," an Amazon spokesperson told Nexstar.