It's possible that some sort of "paper transaction" took place in 2000, and was recorded in the public record. This could have the appearance of a "true" sale, even though it really is not an "arms-length" transaction (between strangers), and no money actually changes hands.
For example, some transactions of this type entered in the public record are:
- A property becomes the responsibility of a personal representative handling an estate.
- A property is being put in a trust for tax, or other, reasons.
- The owner wants to add another person or persons to a deed, such as a spouse or children.
- A life estate is created, where the nature of the ownership changes.
- A quit claim deed is created, where someone gives up their stake in a property. (Could involve money.)
- Additional financing, such as a Home Equity Line of Credit, or new financing is obtained.
I hope that helps.