This story has been rewritten and can be found here: http://www.fimfiction.net/story/12244/Fallout-Equestria%3A-Tales-of-a-Courier-Reloaded

Mr. Horse's pet courier has been murdered and his property stolen. And while the price on the killers' heads is good enough to get any bounty hunter's attention, it's the bonus for returning a silly little poker chip that draws Dead-Shot in.

A pony could retire on that kind of jackpot...

Hope is the faith of the young. Losing everything she holds dear, Puppysmiles embarks on the adventure of her life to find her mother, her hopes of meeting her again driving her through the horrors of a world not of her making. Too bad the Wastelands doesn't care about hope.

Inspired by the heroics of the mysterious mare known as the Stable Dweller, Silver Storm, a guard of the town of Marefort, decides to go on a daring mission to rescue her captured brother. Of course things rarely go as planned and her attempts at heroism drags her into a tangled web of plots and conspiracies as warring factions vie for control over the last great city: Dise.

Spanish Version translated by Spaniard-Kiwi: https://www.deviantart.com/spaniard-kiwi/art/Fallout-Ecuestria-Heroes-996263393