Luckily, my kid’s instruments are always carried on, and computers/ipads/phones, etc are also always carried on. I doubt that there was any item in the suitcase that had cost more than $50 - kid even forgot to bring tux, wound up in concert black (fortunately kid is in the way back). So since mine didn’t lose anything, I don’t know how it’s being handled.
This was obviously systematic, as if opening and rifling through every suitcase is simply part of the assembly line that all checked baggage goes through in Mexico City. I envision a “harvesting” station at the security screening for checked baggage, standing right alongside supposed security. Doesn’t give me much confidence in what security would be like, either, for the checked bags, because those who would accept bribes to allow thieves to systemically rifle through every bag, would also accept a bribe to allow a bomb in the luggage to go through.