In South Africa, there are a number of custom rules that I came across. Here is the source.
6 WHEN LEAVING THE COUNTRY
b) Goods which will be brought back to the country with a value in excess of R50 000 require a form NEP which is obtainable from any of the banks.
R50 000 is currently about $3 350. So according to these rules, residents that leave the country with goods over this amount require a form NEP which is obtainable from any of the banks. But this threshold seems extremely low. Take a laptop, phone and camera and many people will be over this threshold. Anybody with a 2019 Macbook Pro and a pair of paints in their suitcase exceeds it. So does it mean that vacationing South African residents who take these kinds of products with them need to register this with the bank each time they go? What about business travelers who travel a lot? This seems like extremely cumbersome regulation that doesn't make a lot of sense, but perhaps I'm misinterpreting this.
From this page I understand the original is to be kept by customs, so that would require re-submission every time you go out?