I think it just sounds like the three subpoenas they received
I would if the sequence was such that the receipt of eachbof thr subsequebt ones delayed writeup of the overall incident in the interest of completeness or because there was some relationship between them
> the subpoenas from March and April 2023 don't have a gag order. Why mention those months specifically if in the other months they didn't receive any?
Because you are doing an aggregate writeup of a series of events and you want to convey when they occurred and why you are able to do a detailed writeup.