How Kylo Ren Obtained Darth Vader's Mask Explained

In Star Wars: The Force Awakens, we saw Kylo Ren talking to Darth Vader's mask, but how did he get it? Where did he obtain him from? The last time we saw Vader's mask was in the funeral pyre in Return of the Jedi, so how did it end up in his possession?

Dash Star released a new video that tries to explain how Kylo Ren obtained Vader's mask, even citing some information from the Star Wars visual dictionary: it was "scavenged from the funeral pyre", but who could have done it? Watch the intriguing video above, and let us know what you think in the comments section.