Rival nations buy and steal equipment and designs off each other all the time. Why wouldn't the Empire have a few captured or smuggled federal navy ships running patrols after they've been reverse engineered and studied? Nice way to gloat after the fact too. I haven't seen any Federal Imperial Clippers though, have you?
We normally use dropships to carry Biowaste
That's not a nice thing to call the federal marines :V
Clearly this is an incompetently-executed false flag op by the Feds.
I was thinking the other way around; captured dropship but the empire crew forgot to install the right IFF transponders...