What would the violation have been? There is no requirement that a LTCH is required by the purchaser on private to private state residents. So what would have been the "offense"?
What did y'all do before IN started issuing LTCH? What's going to happen if IN passes a constitutional carry and no longer requires a carry card? Petition for the state to have a FOID card system so you can sell to a private party?
No LTCH? Check their ID and scribble up a BOS. OR print out a blank sale slip that are availabe online, if they fill it out (includes their address and everything to boot) I think it's a pretty solid system myself and I have sold plenty of times that way, a lot of folks don't have LTCH, and use a gun just for sporting reasons, if all I own is a scattergun, a 10-22 and a deer rifle I have no use for a carry permit.
If you don't know the buyer personally, the LTCH is a form of vetting. Also, why would you just blindly sell a gun just because it's not required to have a LTCH for private sales. How would you know if the person is not prohibited?