Some accounts get this via /claim. It is called "Gift of Legacies Lost" and you get 999 of them so you can use (only once) on any new character.
For some reason, only newly created account are allowed this. If you are an old account you do not get it. I believe it is to give new players a boost but I think they should give it to all accounts....cause I like free xp pots!
This contains:
10 Potion of Adventure (50% experience increase for 30 minutes)
10 Potion of Speed (Increase your movement speed)
1 Book of Knowledge (5 charges of port to Plane of Knowledge)
3 Package of Defiant armor (1 piece of defiant armor for your level range)
1 Scabbard of Hope (1 defiant weapon for your level range)