Is the following true?

**CONJECTURE:** $\,$ Let $\ B\ C\subseteq\mathbb R^n\ $ be convex bodies such that $\ C\ $ is centrally symmetric, $\ B\subseteq C\ $ and $\ t\!\cdot\! B\ $ cannot be isometrically embedded in $\ C,\ $ for no $\ t>1$.

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>*Thank you Douglas Z. for pointing out the mess in my earlier formulation.*