The reason you were required to provide 2 forms 888 is because, due to the previous refusal, you were subject to section 48 at the time you lodged the application.This particular requirement is often the cause of confusion for people who think that all partner visa applications must be accompanied by 2 forms 888 that are less than 6 weeks old. This is not the case.
If the applicant is a person to whom section 48 of the Act applies, the applicant: (ii) must provide, at the same time and place as making the application, an approved form 40SP or 40SP (Internet) that has been completed and signed by an Australian citizen, Australian permanent resident or eligible New Zealand citizen who claims to be the spouse or de facto partner of the applicant (the partner); and
(iii) must provide, at the same time and place as making the application, 2 statutory declarations each of which:
(A) is made by an Australian citizen, Australian permanent resident or eligible New Zealand citizen who is not the partner; and
(B) declares that the applicant and the partner are in a married relationship or de facto relationship; and
(C) was declared no more than 6 weeks before the day on which the application for the Partner (Residence) (Class BS) visa was made.
The real challenge will be schedule 3. You will be asked for it quite quickly after lodgement and you will have very limited time to respond.