Many things can go wrong when a record collection is indexed. If you're having diffculty finding Koepka ancestors in a particular database at one site, try finding it on another and compare the results.
The Necessary and Proper Clause, also known as the Elastic Clause, the Basket Clause, the Coefficient Clause, and the Sweeping Clause, is a provision in Article One of the United States Constitution, located at section 8, clause 18.
As you already know, the United States Congress is comprised of two houses whose powers are derived from Article I Section 8 of the Constitution. The first 17 clauses of Section 8 list the enumerated or expressed powers of Congress. Clause 18, also known as the necessary and proper clause, gives Congress the flexibility to author any laws necessary to carry out those first 17 expressed powers. The extent to which Congress has stretched Clause 18 is often debated.