You have no way of knowing if the laser you bought is actually 5mW ---most Chinese resellers just say 5mW because that is the FDA legal limit and any output over that is illegal to import. They couldn't care less if you blind yourself--is all about chasing $s and saying/misrepresenting anything they offer that will support that end.
The Survival Laser glesses are more than fine for an 445mm or 450nm laser of 5mW and many time that power. They reduce the power to 1/100,000th of power intensity. As that Survival Lasers page tells you " These Eagle Pair goggles may be used when looking at the spot created by a 100 watt or lower power laser on a non-reflective surface.
See Laser Hazard Chart here:
https://www.lasersafetyfacts.com/resources/FAA---visible-laser-hazard-calcs-for-LSF-v02.png
See info on Class 3R lasers here:
https://www.lasersafetyfacts.com/3R/
If you want to learn about laser safety all of the details are covered on this site is exceptionally good :
https://www.laserpointersafety.com/