The magnets for that latch are actually in the reader rather than the case. I put my 650 in an Oberon leather cover, and glued washers to the corners of the front cover so it would stick to the reader. You could glue washers into just about any cover, I suppose.
I considered using magnets in my cover, for a firmer hold, but I don't know whether they could possibly scramble something. If anyone has a Sony cover with the magnets closure, I'd be interested to know if the covers have magnets there or just steel.
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