- None of the five has the same first and last initial.
- The first customer duplicated a key to her boat and the fifth duplicated her car key.
- Sam was Jake's customer before John, but not just before.
- One customer, not John, duplicated a house key.
- Smith is not the one who got a key to a garage duplicated.
- Susan got a copy of her office key made.
- Mills got a key after the one who got a garage key made.
- Larkin isn't the one who got an office key.
In no particular order:
Order: 1, 2, 3, 4, 5
First Name: Sam, John, Susan, Mary, Linda
Last Name: Jones, Silkwood, Smith, Mills, Larkin
Type of Key: Boat, Car, House, Garage, Office