I'll take a look.

However, if you have an active account with a bank, exchange, etc.. it isn't abandoned property.

Items left in a landlords shed is abandoned property, unclaimed tax refunds, stuff like that.

I would be 100% stunned if they somehow carved out Bitcoin in an active exchange account.

Because they would be stealing from the bank/exchange, not the user. It's a liability to the exchange, and they own(in theory) the asset for convert ability when asked. By taking this away, it wouldn't make sense.