Personally I would just peel and store funds on a trezor. There are numerous risks with holding a Cas with this much value. Fire/Water damage, theft, degrading of private key under hologram, compromised Cas private keys (yes I know it's highly unlikely). It'll be difficult and not really worth the premium to find a buyer, so I'd just peel, redeem all the forks, buy a new car  , and hold the 100btc on something that you know is more secure and password protected.