This is just a model, you can get loads of models for every map. You cannot make them a solid because Cod4 is different to Mw2/BO.
In cod4 we dont have carepackages, but in Mw2/BO the care package has to be a solid, to make is realistic, and also has to land anywhere in the map.
Cod4, however does not have this, All the solid models are placed there in the actual map it self. If you use Forge Mode on a map that has a car, and move the car from where its ment to be, there will be an invisible car there.
Here are list of more models for the map "Vacant"
Originally posted by another user
precacheModel( "com_barrel_white_rust" );
precacheModel( "com_barrel_blue_rust" );
precacheModel( "com_pallet_2" );
precacheModel( "com_filecabinetblackclosed" );
precacheModel( "com_photocopier" );
precacheModel( "com_plasticcase_green_big" );
precacheModel( "com_office_chair_black" );
precacheModel( "com_office_book_set1" );
precacheModel( "ch_furniture_couch01" );
precacheModel( "com_locker_double" );
precacheModel( "com_locker_open" );
precacheModel( "com_locker_single" );
precacheModel( "me_refrigerator" );
precacheModel( "com_coffee_machine" );
precacheModel( "com_sheet_chair" );
precacheModel( "me_streetlight" );
precacheModel( "me_telegraphpole" );
precacheModel( "com_paintcan" );
precacheModel( "com_trashbag1_black" );
precacheModel( "ch_crate32x48" );
precacheModel( "com_cardboardboxshortclosed_2" );
precacheModel( "com_cardboardboxshortopen_2" );
precacheModel( "com_cardboardboxshortopen_3" );
precacheModel( "com_bike" );
precacheModel( "me_concrete_barrier" );
precacheModel( "com_widescreen_monitor" );
precacheModel( "com_computer_keyboard" );
precacheModel( "com_telephone_desk" );
precacheModel( "com_widescreen_monitor_2" );
precacheModel( "com_widescreen_monitor_3" );
precacheModel( "com_computer_case" );
precacheModel( "com_vcr" );
precacheModel( "com_office_lamp02" );
precacheModel( "com_transistor_radio" );
precacheModel( "com_pot_metal" );
precacheModel( "com_pan_copper" );
precacheModel( "com_red_toolbox" );
precacheModel( "me_plastic_crate3" );
precacheModel( "com_propane_tank" );
precacheModel( "com_tv2_d" );
precacheModel( "me_plastic_crate1" );
precacheModel( "me_plastic_crate2" );
precacheModel( "com_junktire" );
precacheModel( "com_copypaper_box" );
precacheModel( "bc_militarytent_wood_table" );