It may be a norm for roadusers to be faced with daily 'roggers' from policemen. The story is similar, if not worse among air travellers.

The number of searches at the international wing of Nigerian Airport are more for extortion than security check.
'What do you have for me/us' is the usual recurring statement during search.

From a recent observation, what is the actual role or reason for searching before Boarding (after the slip is torn etc)?
Or is that post an illegal one?

It seems they are more interested in collecting perfumes that have even passed security checks (since they are less than 100mls).

They trick passengers by highlighting that the goods are flammable (by pointing out the sign), however, they fail to inform passengers that such goods are allowed as hand luggage if they are less than 100mls and in a transparent bag.

What these guys do is to drop these things in a fake trash bin to later share them among themselves.

These are crooks and those that worked on
the 7th January 2021 for Egypt Air Boarding from Abuja are amongst them. (https://www.egyptair.com/en/fly/baggage/Pages/carry-on-baggage.aspx)
My friend didn't get their pictures, but if anyone can capture these people painting Nigeria black, feel free to share.

It is likely the Nigerian government is not aware of these lastphase illegal post at boarding gates.

The authorities should be informed of such.

this is why u need the advice of an experienced traveler before travelling