Once again, in English. It would appear that you're asking about how to handle former employers who have gone out of business, when applying for employment and filling out PRIA paperwork.
Short answer; it's not your problem. You fill out the paperwork, and let the company deal with it. Note that the employer is out of business. You're not required nor should you volunteer, to provide any evidence of employment. Simply issue the data requested; the dates you worked, address numbers, contact names.
You are not obligated to do the work for your new employer, nor should you try. Don't bring in pay stubs, don't attempt to locate training records. The records normally aren't forwarded.
Just fill out the forms, and forget it.
Half of my former employers are no longer in business (or cannot be contacted for other reasons). It's never been an issue during a PRIA check or any other background check. Simply provide the data for the company as it existed, and move on.