Jea48
I am going to go totally against my own belief system, that manufacturing engineers are competent enough to do exactly what you describe in the venting. Just look a some of the places they have not adequately served the audiophile community, such as Power cables. Of course it would not be cost effective for them to include $5k power cables on a $2k device, but it is a point of failure. Then all I had to do was google, 'hysteresis in radio waves', and the first thing on the list was this nice report.
Materials for electromagnetic interference shielding
www.sciencedirect.com/science/article/abs/pii/S0254058420309500
Yes it is at the extreme end of the imagination when considering audio equipment, but it is a recognized problem in the industry. AND slots are not HOLES or mesh either. Most slots on audio equipment would do about as good a job of keeping out radio frequency as it would a bucket of water. Normally I would demand (if I were you) that I provide you proof of that statement, but I would have to demand you proved me the tech specifications on the particular slots you wish to discuss to be able to argue the point. Bottom line, it is an industry concern that is being studies and addresses currently with some fervor and I just in an armature status though I would look into trying a few things on my system.
Also when I was asked to show a need. On another post here Carlsbad2 remarked to one person about his body conduct signal like a "High Impedance conductor" with something about using his "Hook and peg leg" I thought that was a good poke in the funny bone, but yes we just today saw this discussion on spurious signal propagation.
