Like i said in my post earlier, it will help us find out that R10 has been done or not, won't tell the exact stage but that will confirm that your IP1 stage was over for sure, i.e if your application has been transferred to CPC- Ottawa or LVO, then definitely you must be closer to IP2. Its a more of a hit and trial, but no harm in trying , and after your reply comes we can be further sure of things. It will be some relief i guess.
Definitely the best way is to know GCMS notes . but it takes 30 days for them to come.
Another way is try calling them.
I will repost my post here-
I have deduced a way to know that our IP1 is done or not, by studying different cases, i have come to an understanding that ip1 (R10 Check) is done at CIO Sydney, like before your IP1 if you e-mail to CIC to know your visa office, it will most likely be given as CIO sydney, but after this stage is complete our files get transferred to either CPC Ottawa or LVO, So i have decided to e-mail them in like 10 days from now to ask my VO, that will help me a bit to decide my stage, as I also like you am not sure that whether my Ip1 has started or not or i missed it. So I am going to wait few days , if nothing happens then I am going to e-mail them. Yu can try this if you wish.
Note:- Sometimes due to load sharing files stay longer at CIO and checks after R10, i.e A11.2, criminality etc. are also done there, so we can never be sure about anything with CIC, but as these days in most cases change of VO is happening after their IP goes to NA, i suppose this is a good try.