actually not only 1 but 2 post office there.

the one i show u is i think should do parcel one: https://www.google.com/maps/place/Pos+Malay...48b707bb8e03fbf

both post office also in the same direction, after you go out from kl sentral, turn to right and walk.

the first post office you need to cross the road. it's a small building.

the 2nd post office is very big, but no need to cross road if you walk out from kl sentral and turn right as well.

here's the simple one, remember nu sentral shopping mall got a bridge that connect to monoral?

there's 2 escalators in the bridge right?

take the escalator that nearer to the kl sentral.

after go down walk straight ... that is the direction of post office.

yes, you can buy 'kotak' from them and send your parcel. they have special poslaju kotak one.

as long as you got $$$, poslaju will deliver anything