I feel your pain. It toom me a while and I looked everywhere. My last 2 were in the area
where the saber key is just after you jump the electrical rafters turnaround to face the
rafters and on the right is another platform where the saber key is. Try there otherwise
look everywhere you go sometimes they are up high and don't make any sound. Good luck.

Try where the saber key is thats where i found my last two.

I think the last two cockroaches are near the saber key!!!!