This concept idea would most probably have been developed into a 10-pager starring Donald Duck. The plot is partly reminiscent of the one in WDCS268 Christmas Cheers. Maybe this is why Barks at a later date wrote 'Bought' in the margin of his draft.
The main plot is that of Donald wishing for a rock garden, and he buys a giant rock from a neighbour. To transport the rock to Donald's house a truck is used, but it collides with a truck from the museum carrying an identically shaped and sized gold nugget. After the crash the two rocks have switched places, and Donald gets the museum's rock without realizing its value.