I do not mean that you will lose your seed. I am saying that your seed could theoretically be compromised on either the Cobo wallet or the Keystone wallet. Who in this case, in your opinion, will be to blame?
Listen dude... I don't know if you don't understand English language or what, but I said
I won't blame anyone, and I don't know what you mean ''compromised seed''.
Cobo and Keystone are never connected with computer or internet in any way so there is more chance of someone finding your paper with seed words than extracting them from your device.
Simple procedure, import seed to Keystone, than reset old Cobo device, remove battery and use hammer to destroy your old device if you are not refunding it.
If you refunding old Cobo device, than send coins to other non-custodial wallet, reset device, never use that seed again, and send them your Cobo wallet for refund (if they ask for it).
If you need to blame someone than blame yourself for making poor decisions and mistakes.