If you buy crypto currencies in one country and then travel to another country, as long as I have the passphrase and private key on paper, hidden in mulptiple places and the crypto on an online exchange, no kyc, p2p bought, non custodial and bought on a clean laptop, can I delete the website from by laptop, including the online wallet, and then sign in again to that exchange after travelling.
Custodial wallets and non custodial wallets, please choose later one (non custodial wallets).
What makes you choose online wallets in the first place? They are risky type of wallet. If you do not choose it, you won't have to worry about leftovers in your smartphones, laptops when they are in hands of anyone else.
When you use a non custodial wallet, the best is create that wallet offline.
I have heard, dont know if it is true, but better safe than sorry, that they now have devices to scan your smartphone and laptop to see what is on it.
Do things offline and secretly, you won't have to worry about them.