I believe the amount of crypto they have seized from people about whom the news pops out once in a while should be more than this, unless they don't account for everything.
Waiting for the Nigerian government to he honest with you is like waiting for a chicken to pass out urine from its excretory organs. Those figures are leftovers after they must've shared a large quantity among themselves as the big players, they now report clearly manipulated figures for public consumption. The quantity of coins they seize from these boys at regular even amounts to billions of dollars, but Godfatherism and corruption wouldn't let them be honest in their dealing with these crimes.
I think the leaders deals very much with crypto, they know what is obtainable and whopping benefits gotten from it, and the freedom the average citizen could get from it. Knowing fully well it might work against their political ambition which they achieve by keeping the citizens hungry, so they fight crypto which has brought liberation with all their strength to remain in position.
One thing I know is this, fighting against crypto is like fighting against the future. No one can win that fight with the future because the future must always come. Crypto is that future and it must prevail.