Your Indivision is missing the lower socket then!!!
Every Indivision ECS is equiped with a black socket that is inserted in those short pins.
Just grab a socket from a local electronic store. If you can't find an 48pin socket, just get 2x40pin ones (that they are more common) and cut the remaining required pins like I did:

Although it's putted on the socket of an A603 for a different reason... you get the picture.
I guess, since it's second hand... the previous user who pulled from his mobo... left the socket in his mobo instead of the Indy

No worries, easy fix.