Are tenancy agreement copies absolutely vital for a successful Hong Kong right of abode application?

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QUESTION OF THE WEEK

For my Hong Kong PR application, what happens if I am unable to provide copies of my tenancy agreements? 

I never thought I would still be here for 7 years so I every 2 years I get rid of old documents i.e. bank statements, tenancy agreements, utilities etc. 

Also for years 3~7 I was living with my ex partner so the tenancy agreement was in his name or his employer’s name.

What can I do? 

Will utility bills be enough?

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