Is it all silicon or wooden box with silicone liner?
I have a regular sized wooden mold from them and they told me not to CPOP with it as the wood can warp or glue would melt or explode or something (I don't remember exactly what - but do remember they said not to).
If it is entirely silicone, you should be fine since silicone is designed to be used as bakeware at much higher temps than we hit. To be absolutely sure, I'd send them an email. That way if it misbehaves you can hold them to their instructions.