you can't construct makeshift cover from boxes
Im quite sure you can ... will try next time i will be in and will have enough boxes around.

I approached the game by getting as much singular pieces of food as possible because I didn't want tospend money on supply packs unless I really couldn't avoid it, since I wanted to have money saved for weapons and potions and stuff.
Same here ... i never buyed it either.

I simply dont long rest too often.

Somehow i'm always hard-up for gold in my playthroughs, or at least it feels that way.
Yeah, know the feeling ... the problem is that looting most of things in this game will not help you much.

Sure there are some +1 magical items (Grymforge is a goldmine

) that are actualy worth something, but besides that? Mostly trash for barely few coins.

Really ... all you need to do to keep your pockets full it keep an eye for hostile Vendor NPCs and make sure you knock them out instead of killing them ... you can finish them off after looting tho.

Most regular mobs have litteraly nothing interesting in their pockets (maybe except Crusher ... but im not quite sure if he is conciderable "regular") ... unless you want vials of acid, bottles of grease and simmilar stuff ... same goes with objects (except few skeleton remains), even tho there are often lockpicks, but honestly if you miss like 70% of them, you still will have enough.

Furthermore, I've been trained by games to be paranoid and to think that any container could contain something that might be useful or interesting somewhere down the line.
I believe that is the problem here ... we are using rules we learned from single game to another game.

But as we can easily see, they dont aply here:
Looting is tedious, our inventory gets full very soon, it takes lot of micromanagement ...
What does it say to us?
A) Looting is wrong and should be re-created so we can enjoy our hamster disorder.

B) We are not suppose to take every single bone we find, nor to search through every single body we find.

Choice is ours.

Frankly BG3 feels like exactly the sort of game where finding an innocuous item turns out to impact something later down the road, so that's all the more reason for me to continually rummage. I would not put it past them to plant some "old stick" somewhere and then reveal later if we picked it up that it's actually some kind of wand or artifact. There's nothing like that in the game now, but we only know that because we've played through this section over and over again. On a first-time playthrough, you have no idea what to expect.
Well, as far as i know every single interesting item have implemented some comentary either from your character, or from your followers, when picked up.
The Stool of Hill Giant Strength is great example.

But as far as i know, Detect Magic is part of PHB, so i dare to presume this problem will be solved by that.

Personaly i will certainly take that spell once possible, especialy if it will highlight boxes and bodies with interesting loot.

I think MrToucan really hits the nail on the head when he asks what purpose the containers serve. Does having all these containers actually make the game more fun? If a feature in the game world is more likely to detract from the fun of playng the game and ignoring that feature is the reccomended way to enjoy the game, then that feature's inclusion is a detriment, and the game continues to be enjoyable in spite of its presence rather than because of it.
Well ... yes.

It does make the game more fun.

You see the containers have much more uses than just being looted ... for example:
- Some can be thrown. (Or they use to ... i didnt do that in a while. :D)
- In some cases they can ensure you safety. (Once i blocked the metal latter by Ragzlin, wich were made indestructible so NPCs have allways option to get close to player ... well, they didnt.

)
- You can use them to create provisory stairs and jump to higher places.
- You can stack them and climb on to get instant high ground.

- As i said on start of this post, im quite sure you can stack enough crates together to create provisory wall and hide behind it.

You just need to start thinking outside the box.

Wich is exactly what Larian keeps pushing us to. :P