請問會否自己不知道自己破產了，因為本人最近收到一間律師樓的信件，說我破產期已過，叫我去申請解除破產令！?

Remotely possible.

1. A legal proceeding can proceed regardless if you have been notified or not.

2. A common occurrence for those impacted by bankruptcy is having all credit accounts closed (as the bankruptcy will be reported to the credit report). If you have no credit account, it will be difficult to know if you are subject to bankruptcy or not.

The easiest to confirm this is to buy a credit report.