Either way he will offer you far less than the true value. Another much romanticised option is to buy a yacht and sail it into the wide blue yonder. This loophole has been closed too because there is a central yacht registry that keeps tabs of all the yachts being built and sold. If the powers that be have a suspicion that you have floated a few million out the back door they can track you and the boat down. Again there is the issue of dealer commissions and VAT and the risk that the destination country may not have a demand for African artworks.
Some brave souls specialise in brokering asset swaps.
This is where you have a foreigner who needs money in SA, willing to swap his currency and leave it in the country of origin. This can be risky business because the success of these deals depends on the trustworthiness of the individuals involved. If things go awry neither the broker nor the client has any recourse to local authorities as they were both acting underhandedly. So when it comes to investing offshore it is far better to stick to the limits of the law. Devious tactics could end up costing you more than the tax you would have paid to qualify.