They still use the 25th bill to wrap the other 24. The franc seems quite stable now. The two years I was there it stayed around 500 to $1 and now (i just checked) it is 437 to $1.

I talked to pilot once who used to haul money for Mobutu. They would leave Kin empty and go to Brazil non-stop. On the return they had to make a fuel stop because the DC-8 was so heavily loaded with paper money. The next stop was Gbadolite to give the old man his cut, then on to Kin with the rest.