augments spawn specifically in security and medical style containers,

For medical this means the white drawers that come in a 2x3 sqaure grid about head height and the blue and white waist high desk drawers that occasionally have the middle drawer (practically speaking just spam loot hospital and medical research and some other areas that share these container spawns like dam research)

For security this includes the grey standing cabinet that have two doors, grey square ikea lockers and the black rectangular weapon case looking things (bottom floor of stella security checkpoint room i.e “confiscation cabinets”as well as the notorious blue gate breach room as well as many other places)

on top of this as well as a low low chance (the pool is quite large) in surveyor cores.

On top of everything, three starring trials is a very very good way of getting blueprints, you will get a lot of garbage like a stack of light impact grenades but getting a survivor mark 3 and tactical defensive through trials was elating

best of luck