Photo: ClaudioDivizia/Depositphotos

Less and less people are using cash these days, preferring quick contactless digital payment.

Every piece of currency printed has a unique serial number.

These unique numbers help track stolen money and stop counterfeit money from being circulated.

Pile of dollar bills

Photo: ClaudioDivizia/Depositphotos

A clerical error led to the Fort Worth facility printing those same serial numbers in 2016.

Apparently, no one caught the error until after they had entered circulation.

The double printing of the serial numbers has never happened on this scale and is attracting collectors.

Front of dollar bill

Photo: STILLFX/Depositphotos

Or you might hold on to your bill and start searching for its partner.

Matched pairs have sold together for almost $10,000.

Better start uncrumpling your dollars now.