This was a company so for sure they bought it and put it in multisig accounts maybe even under custody of some insurance backed company like Bitgo.
Is it hard to read a few posts and find out how MicroStrategy buys BTC - rather than continue to speculate and copy other people's answers? We know the way he buys, we know when he will buy approximately (there is always an announcement), but that doesn't help us at all because the way he buys never affects the price.
I am sorry if you think I copied other people's answers?
I read the story, on Financial Times, but it never gave any of those information so my first response was to title of thread saying "his bags" which clearly it could not have been. My second response I do see now that you answered about Coinbase being the ones buying for them. My bad for missing that.