Too right - failure to produce the inocculation document, at either location, will result in a hefty fine and an insistence on you having a booster injection on the spot. Lagos airport is Danté's 9th ring of hell and it only gets worse from there. Sound advice: don't even consider driving...
Some time ago I visited Lagos and on 2 separate occasions lived in Nairobi. Lagos is 4th world - aggressively hot, chronically under-developed, chaotic in every way and Nigerians - or those that live in Lagos are - pushy to the point of being arrogant. About what? Kenya { Nairobi } can be pretty...