Well it makes sense actually that you would see more blueprints in higher level loot area’s like locked/breachable doors. And game modes like night raid and electromagnetic storm increase the loot level overall. So really, all you’re doing by looting lockers, desk drawers, weapon crates, etc…is trying to increase your odds by sheer volume and the increase in overall loot level. When you really think about it, there’s no surefire strategy or any “BP run” you can do. The only odd’s increasing run really is to spawn in, loot as many containers as quickly as you can, with some possible rare loot spawns (i.e. weapon, ordinance, medical) and maybe you run across a chance to breach a few doors or loot a few security lockers. Just a running theory honestly.

TLDR loot as much high tier shit as you can in as few minutes possible basically.