I probably created 1 per day for 3 days, so about 3/4 CSEs. I'm getting responses today to all of them, which is kind of annoying since it's the same response over and over (we are forwarding this to the responsible officer etc.).
I just got a reply saying that they have forwarded to the responsible office.
After talking to IRCC agent and asking about this issue, she informed me that they cannot confirm whether my CSE is actually sent or not. I got worried yesterday and sent a new CSE. I checked which CSE they are responding to and see it is the 10th of April CSE I sent. I hope they will see it is a duplicate.