Can a Bahamas IBC's documents be apostilled?

Yes. The Bahamas is a party to the Hague Apostille Convention, so apostilled Bahamian documents are accepted in other member countries without consular legalisation. Order the apostilled set together with your incorporation documents if a bank or counterparty abroad will need them, so you avoid a second round of paperwork.

Certification and apostille

Source: Status table: Convention abolishing the requirement of legalisation for foreign public documents, Hague Conference on Private International Law (HCCH)