With the new release some objects seems to have moved to CUP Terrains Maps.
This is noticeable when starting VT5 with just CUP Terrains Core loaded, then i get the warning messages
Warning Message: Cannot open object ca\desert2\data\plant\bush1.p3d
Warning Message: Cannot open object ca\desert2\build\boatsmall_2a.p3d
Warning Message: Cannot open object ca\desert2\build\boatsmall_2b.p3d
in the rpt but also in a message box.
With CUP Terrains Maps loaded too these messages go away.