A SEP, and other retirement accounts, are trusts. The manager of your accounts is the trustee of those accounts. It can't be just you with a retirement account, there is always a trustee.
E.g. Mass Mutual Trust Company, Directed Trust Company, etc
The LLC is owned by the SEP (the trust). Anything owned by the LLC is in the SEP.
I'm a developer on the OpenBazaar project which is a p2p Bitcoin market. Because DNMs are the most popular Bitcoin marketplaces I keep up with them and their features and trends. They're great sources for discovering security concerns.
They almost certainly did. I do market research and a number of vendor keys changed on Hansa and Dream on June 23rd. Some had various comments in them claiming to be older, e.g. "EST June 2016".