What to do - No Custom's documents for Shuttle Buses?


I am here at Ladipo, Lagos - trying to buy a shuttle bus.
The budget for this is between 1.5 to 2.0.

I asked the sellers about Custom's documents - that I need to
verify the custom's paper regarding payment of duties on the bus before
buying any. I do not want to have any problems with Nigerian customs.

I have been just told - by multiple sellers at Ladipo - that they do not give
Custom's papers for shuttle buses; that shuttle buses are imported into the country as spare parts,
and then assembled in Nigeria. That the only documents I will receive are receipts
and change of ownership documents.


I understand that the shuttle buses come as spare parts ...

Questions:
(1) But what if I run into customs guys and they ask about custom's papers?
(2) What if I go to register the shuttle bus to get plate number and other documents and they ask about custom's paper?
(3) What if I drive the shuttle bus from Lagos to Anambra - how am I going to handle Custom's guys?

Guys with experience, please I need your advice. I don't want to be at the mercy of Custom's people.
I am afraid that the shuttle bus risk being impounded, so a big risk of losing 1.5 - 2.0 in the future.


Thanks!