Can i request for a copy of my working contracts in Hong Kong?

Dear Sir/Madam,
I worked in Hong Kong for 10 years and now I am working in Canada, I just noticed that my first 3 contracts under 1 employer was missing, are there any chances or possibilities that i can request for a copy of my old working contracts? I am now applying for an open work permit and residency so i needed to submit all my previous working contracts from Hong Kong.