R106.3.1 Approval of construction documents
. When the building official issues a permit, the construction documents shall be approved, in writing or by a stamp which states “APPROVED PLANS PER IRCSECTIONR106.3.1.” One set of construction documents so reviewed shall be retained by the building official. The other set shall be returned to the applicant, shall be kept at the site of work and shall be open to inspection by the building official or his or her authorized representative.
Even if they were kept on site, as stated, they do not have to allow you access.
Don't know how you are supposed to build to a set of plans which as not available - could be one reason why it will keep HIs in business?
If the AHJ does not enforce it, all you can do it ask the AHJ why, and do it in a way which endures you to the building official. Something like, 'maybe the reason why your inspectors and us private inspectors find so much done incorrectly is that the plans and drawings are not on site and are not available to the actual workers, maybe if they were kept on site less would be constructed poorly, or at least the excuse that there were no plans on site could not be used ... I think it says something in the IRC about that but I can't remember where or what it says, do you have that?'. What you've done is brought it to their attention, and ASKED THEM if there really is something in there, and could they 'splain it to you. That only works, though, if you've been making contact with them in the past.