The U.S. Currency Auctions' Pricing guide shows that a $2 bill, which features the third U.S. president, Thomas Jefferson, could be worth up to $4,500, depending on certain factors. Compared with other bills, the $2 currency is considered more rare, although they're still being produced.

"Americans don't spend $2 bills, because they think they are markedly scarce. However, the numbers tell us a different story," Dustin Johnston, vice president of Heritage Auctions, told MarketWatch on Wednesday, noting that some bills could be worth up to $20,000 at auction.

The auction official issued a caveat: "Just in the last five years, they've printed 100 million $2 bills. The fact that they don't circulate and are kept as mementos is a little bit odd. Very few of them have numismatic or collector value."

And Art Pinto, the manager of Legacy Coins and Curiosities in Florida, told Fox 13 that there are several contributing factors that help determine the potential value of a $2 bill. He noted that newer bills have a green seal on them and are likely just worth their face value, but if the bill includes a red seal, it likely is worth more.

"If you're looking for a high dollar $2 bill, it would be pre-1900, and it would have to be in a very high-graded condition," said Mr. Pinto.

Mr. Johnston told MarketWatch that other than the date, people look for serial numbers and the condition of the bill.

"What we look at is fancy serial numbers," he said. "A serial number '1' for a 1976 $2 bill would be worth $20,000 or more. But a majority of those people holding 1976 $2 bills, they are only worth face value. There are very few that actually exceed face value."