Report Of Sumptuous Fur Dupe - Trigger Unknown (Patreon)

There is a report on the official bug report forums concerning the apparent existence of a sumptuous fur dupe. https://us.battle.net/forums/en/wow/topic/20769609352

The Draenor Garrison building "barn" allows the player to use a trap to cage appropriate animals after taking them down to low health. According to the poster, one time in twenty a mob will glitch out and can be repeatedly caged every 5 seconds (the trap's cooldown) providing a fast and unlimited stream of sumptuous fur. 

Fur is still valuable despite being an material from two expansions ago, for producing Hexweave which itself produces Hexweave bags-one of the largest bags available in the game that is still worth over a thousand gold.

Neither the original poster nor myself have yet been able to isolate the source of the glitch. This article may be updated.