How to Ascertain that a 50-Gram Credit Suisse Gold Bar is Genuine?

Visually inspect the Credit Suisse gold bar to spot any imperfection in coloration and lettering.
Weight the bar to ensure that it is 50 grams, exactly. A fake bar that we have encountered has weighted 32.4
Measure the length, width, and thickness. The numbers should be 47mm, 27mm, and 1.9mm respectively. If it’s a Valcambi bar, then the measurements should be 74mm, 52mm, 0.8mm.
The imprint should mark Essayeur Fondeur “CHI,” not “CHE” or “CEI.”
There should not be any wording to the effect of “COPY.”
The back of the Credit Suisse Gold bar is always stamped with the name “CREDIT SUISSE,” repeatedly.
It should not be magnetic.
Most acids will not be able to discolor 24K gold. Only a strong solution of Aqua Regia can dull its color slightly.
When dropped onto a solid surface, this gold bar should make a high pitch noise, not thumbing noise. Plus, it will chyme for at least a few milliseconds.
When in doubt, one may choose to drill into the bar to ensure that it’s not Tungsten inside. We have not yet encountered a 50 gram gold bar that has been “filled” with other metals.