I am getting my Laptop fixed/replaced
Your story is hard to understand. Please omit anything that's irrelevant to the problem.
Looking again at my Ledger and transactions I think I may have transferred money from BTC to USDC in order to protect it during the bear market but forgot about it. Either that or its been stolen
I am pretty sure its the former but is there any way to check.
Follow the transactions online, see if you can find if you sent it to an address of an exchange.
It sounds like you just forgot you made a transaction. It's always good to label transactions, so you still know what it's for years later.