The id rhysduk is refering to is not its name, it's just a unique reference for the map.
You can use the Object command with the id to get the bush object. For a bush on malden with the id of 3175 try this:
Hint Format["%1",Object 3175]
But if you try using the typeof command on the object, to get it's classname, it returns nothing. So I'm not sure if you can use objectid to camcreate a bush?
You can using an editor addon like GunSlingers. So then they would be:
AAA175
AAA174
AAA9Z9
AAA756
AAA474
AAA475
AAA170
AAA171
AAA172
AAA173
AAA98Z
AAA152
AAA153
AAA154
AAA155
AAA156
AAA759
AAA753