Herf-a-dor Replacement Clasp

That case might be made by cigar caddy.
if it is a current model made by Cigar Caddy, the clasp should come off by pushing upward on it. a new one will press fit back into place. if it does not come off, then it is not a Cigar Caddy. you should contact Cigar Caddy instead of Otterbox. Otterbox does not own Cigar Caddy, so you might get quicker resuls contacting Cigar Caddy.