No those are all gimmicks to get people pranked by the maker and to download a "map" that often is just sky writing saying hahaha you fail or something like that. If the map says you get credits upon download do not get it.
Go to forge and make a map and then you go to the menu and slecte add map in halo Reach
maybe
You can download Anniversary Maps to Halo: Reach but not to Anniversary.
YES! Halo reach has a "Forge" feature, which allows players to create maps, the reccomended map is forge world.
on halo reach you go to main menu and select forge and then select your map there start building your own map and i recommend forge world
a new map or map modified on forge? if you mean a forge made map, make an account on bungie.net and they have a bunch of map variants on their site
The Halo Reach Beta will include four maps. You can read about them here.
Forge is not in Halo 2 and comes out in Halo 3 and Reach
that does not exist
At the moment there is no map that has the Elephant.
Forge World.
you cant get the default map cage in halo reach but you could try to remake one for your self