The Casascius physical bitcoin collection created by Mike Caldwell is one of the most popular physical BTC collections.

There are 19,676 physical coins left unredeemed or active, according to casasciustracker.com stats.

Caldwell also made gold bars with bitcoins loaded onto them like the popular 100 BTC gold bar. There are Casascius physical bitcoins that hold 25 BTC and even units that carry 500 to 1,000 BTC.

For instance, on March 30, 2022, an “S1-COIN-25” that’s worth 25 BTC was peeled and redeemed for the digital value of $1.14 million.

There are approximately 42,516 BTC left unredeemed

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There’s a slew of unfunded coins on the secondary market selling for collectible purposes only.