I think I am the one who has been waiting the longest time in this thread.
No, we need one security start and 4 security screening at least. The first 3 security screening are the thing done on IRCC side sending everything to CBSA, the 4th security screening is the reply.
I am waiting for the 4th one too.
I received my notes from CBSA. Everything is there. Nothing wiped out
My file location full name is: PS-SEC-PENDING
3 security pending activities:
1st: Not started with date Jan 13 2017
2nd: Send to CBSA
3rd: Received by CBSA on 2017/04/26
After this, nothing happens except extended MED in Nov 2017