Hi ... where did you find a Cuboid? ...that was released in 2016 ... is it still in decent condition?
You say Cape Town...but your profile says New York ... is that VPN maybe?
There's a saying with coin dealers, "trust, but verify" its not necessarily the guy at the counter, but the guy who sold to him.
Their overseas supplier might have cheaped out.
Depends on how cheap they were.
If R50 each then maybe rewraps.
Best to weigh them on a scale, my 25R's weigh 43.45g & 43.7g.
But my no name 18650 from a laser is 30.4g.