Found Money

What Does Found Money Mean?
Money or funds that an investor possesses but just discovers.

Investopedia explains Found Money
The term found money is used frequently in reference to money or funds that were previously misplaced or forgotten and then rediscovered. For example, the $20 you found in your old winter jacket last fall is found money. You put it there previously, forgot about it when spring came around, and then found it when you needed the jacket again.

Banks have many accounts that have been left dormant for years because the account holders have forgotten about them, and some government institutions have refund checks for individuals with invalid addresses. Found money can be a nice surprise when it's discovered.