请帮忙翻译下句的正确英文，谢谢！不要机器的翻译，非常感谢！

以前我们的保函都是在ICBC银行开具的，草稿确认好后，正本马上就能开出
Previously, our L/G (Letter of Guarantee) issued by the ICBC, once the draft L/G confirmed the final copy can be officially issued immediately.

Previously, our L/G (Letter of Guarantee) issued by the ICBC, once the draft L/G confirmed the final copy can be officially issued immediately.

Previously our L/G is drawn by the ICBC. After the draft is confirmed, the original copy can be drawn immediately.

Formerly our Letter of Guarantee were issued by ICBC。Once our drafts were proven by them，the originated one will be sent 。