Metal Gear Solid Delta Loot and Stealth

I'm playing Delta. I played the Original game like 18 years ago, I dont remember much. I want to do a stealth no kill playthrough on hard. The problem im having is that there are all these cool gadgets and camo hidden around but looking into every corner and closet in a stealth game is hard for me with a map full of enemies. How do you guys deal with this? I'm a bit of a completionist so its hard for me to just run through a level. I have the thermal goggles and the desert tiger camo seems pretty op so maybe I should just get through levels without looting, idk.