This items can be given to Cristóvão Caldas awarding you with 2500 reputation or more for some races, reputation bonusses or a trade house in your garrison. For me as a human Alliance with trade house level 3 it gave me 3250 reputation.
The items also give credit to the achievement Caçador de recompensas by looting them all once.
Since Blizzard deactivated Ashran PvP, Crafticus Dobramentes is now standing outside of the Sprocket's Garage in Escudo Tonante next to the other PvP vendors. If you haven't earned the reputation with the Vanguarda de Wrynn before the deactivation, you will no longer be able to get it done. Medalhão da Legião used to offer reputation with Vanguarda de Wrynn but other players has confirmed it no longer does. If you didn't complete it before, then you are out of luck with this one. Players who did in fact get the reputation to exalted will still be able to purchase his goods though. While Máquina Voadora Portátil Descartável only requires friendly reputation, it's useless now when you can't access Ashran anyway so don't waste the gold on it.
Forças da Aliança em Ashran, posicionadas no Escudo Tonante.