anyone ever have an issue with not returning tourist cards?

It will be awhile before absolute tracking is possible. Look at the insanity at major border crossings. If that stupid migra had asked me about a missing gringo pasaporte missing stamp I would have responded with...

Please tell me EXACTLY as to how to go about doing this at Garrita 2 Tijuana?

If INM gives you a hard time for no reason, get their name and badge number. Make out a report with an Angeles Verdes. It is a Denuncia Federal. Se golpe el ventilador con esterico believe me.