Originally Posted by
IAN-UK
Boiler-plate anodyne and placatory it may well be, but i'm not sure what other type of response a whistle-blower might expect. I'm sure our OP doesn't expect a medal, avios or even
a photo of a crew member being flogged 
. What happens behind the scenes is the important thing.
Iberia cabin crew will (most probably) be reminded that cabin checks are not merely "security theatre". If the regulator or the airline's safety team receive the complaint/notification this is a pretty certain outcome.
There's websites for that so my friend tells me.