testpilot
"Coins" are deemed as currency/cash, and most policies limit the amount of currency that is lost. Rare coins are collectables, and require an appraisal, otherwise they will reimbursed on face value. I would bet that your insurance carrier/agent misunderstood your request.+1. Also not typically covered unless listed on a separate rider: Recordings (LPs and CDs), computer software, art and - as testpilot suggests - anything that you want to insure for its "collectible" value.