Seller is original owner. I have used Bricklink to meticulously inventory and count the pieces to verify level of completion. The set is missing 28 pieces in total. Part numbers and quantities are listed below. The manuals are in gently used condition with some creases. The set originally came with four manuals, Manual 8274-2 (2/2) is missing. Stored safely away from the elements in a smoke and child free home.

Missing Pieces & Quantities:

* Black hose 4L - Part #75c04 (1)

* Black Technic Axel 12L - Part #3708 (1)

* Black Tire 4mm - Part #3139 (2)

* Light gray tow ball axel - Part #2736 (1)

* Light bluish gray Technic axel - Part #6536 (8)

* Light bluish gray Technic axel w/ pinhole - Part #32184 (1)

* Light bluish gray Technic axel connector - Part #6538b (3)

* Light bluish gray Technic axel w/ pinhole - Part #32039 (6)

* Light bluish gray Technic 1x4 gear rack - Part #3743 (1)

* Light bluish gray Technic Liftarm - Part #2825 (4)