One Time Reputation Bonuses for Each Faction from Bountiful Delves

wowhead.com:

Bountiful Delves provide a one time reputation bonus for each faction — but you might have to work for it!

While most players are saving their Restored Coffer Keys for the start of Season 1, players have discovered that there is a one time bonus of 1.1k reputation for each faction from Bountiful Delves.

This reputation comes from actually USING your Restored Coffer Key, so players have started to use their keys on alts that they don't care about in order to get this reputation. However, this reputation is not guaranteed and also only seems to be a one-time bonus per faction and not Weekly despite what other people have stated.

While the exact details of how the reputation works is a little fuzzy, here's how we think the reputation works:

• Using a Restored Coffer Key at the end of a Bountiful Delve causes you to roll a 4 sided dice (d4).
• If you land on a faction that you have not gotten reputation from, you get 1.1k reputation for that faction.
• If you land on a faction that you have gotten reputation from, you get nothing.

This means that there is no guarantee that you will get reputation at any point. The first Restored Coffer Key you use will guarantee reputation, the second will only have a 75% chance you get reputation with a different faction, then 50% and then to get the last faction, you only have a 25% chance of getting the reputation to finish things off. This means that it can take as little as 4 runs and Restored Coffer Key if you get lucky or 10+ runs if you're not. This does take keys that drop higher item level loot next week so make sure not to spend any keys on the characters that you care about if you want reputatio now.

You can check which factions you've gotten already by running this script, made by Anshlun:

/run for k, v in pairs({ Assembly = 83318,Council = 83317,Spooders = 83319,Hallowfall = 83320}) do print(format("%s: %s", k, C_QuestLog.IsQuestFlaggedCompleted(v) and "\124cff00ff00Yes\124r" or "\124cffff0000No\124r")) end