Many, many products we use are repackaged from bulk. Grain, hops, minerals, additives, etc. I imagine DME is no exception.
It wouldn’t surprise me if one division of a mfr (Briess, Munton’s, etc) receives bulk packages of DME from another division in the company and repackages it. Many online vendors (More Beer, Northern Brewer, etc) do it. ...the same way your LHBS does.
I would recommend they repackage under vacuum in airtight packaging to eliminate moisture so they don’t end up with solid DME bricks.
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