MOSCOW, Aug 11 (Reuters) - The silver medals Russian sprinter Tatyana Firova won at the Beijing and London Olympics are stored in a safe in her apartment near Moscow in defiance of the International Olympic Committee, which has wanted them back for months.

Firova is one of six athletes who told Reuters they had yet to return Olympic medals and diplomas from the Beijing and London Games that were revoked over the last year after their samples, or those of relay teammates, tested positive for banned substances.