There’s lots of financial assets that do not have a physical thing.

Cash is just a paper that represents a piece of the total value of its applicable network of government over-reach.

A bond is a promise to pay back debt in some nominal fiat amount.

A life insurance policy is just a written signed contract.

A stock is just a pice of stated ownership in a company that could die any minute.

A deed to real estate is a temporary consent from the applicable government that you can use the land if you pay enough tax.