I have only been steeming since July, but I have access to them all.
As far as I'm aware they can't be edited but they are in the blockchain. Low voted or flagged posts I've noticed in general are hidden sometimes, but can still be revealed.
My poor internet access can make it slow process if I am simply scrolling through my feed.
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I scrolled your blog, I see all the posts:) May be it's my personal bug:)