I still think Burt s connected to Raydon Labs. It will be found in einglewoods neighborhood right near ground zero and is home. Burt was delayed getting to his own store because he was delayed trying to contain one aspect of the initial outbreak.

Interestingly, einglewoods labs is a real life skin care products company and we know how much KC likes to put breadcrumbs in the names. For example all the survivors in the tower were also survivors of the Tianic. It's all about the weave.