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I guess you may also pre-screen the candidates (or technically your employer should, since legally, you are not allowed to be involved in the recruitment process) and see if there is some legitimate reason for not hiring them even prior to the interview. If that can be documented in the recruitment report, you should be still okay. But keep in mind that for RiR, your employer\'s requirements cannot be too restrictive (no special requirements made just to fit your qualifications, foreign language skills that are not necessarily needed for the business, offering salary that is below the prevailing wage in your area, unfavorable working conditions, etc.)
The reasons for not hiring any of the candidates will need to be well documented and "legitimate". Ideally of course, the candidates would decline the job offer themselves. That would be the best scenario, easy to document. If nothing works, you may need to start the process all over again, since only advertisement within the preceding 6 months counts for RiR. No one will ever ask what happened before.
Let us know how things went.
H.