Do items restock?

[Thirtyeight]

I'm just finishing up the offices and preparing to move on but I'm running low on markers. Do items ever restock or is the game designed to force you to keep going forward or risk running out of supplies?

[burger boy]

general resources respawn, eventually.
-- one like the computers and crates however, do not. ( by default ).

this can be enabled, and accelerated via the sandbox settings menu.

[Atlas MK II]

Things inside portal maps also respawn every so often

[MechWarden]

By default, resources in the Facility does not restock*. You can can have small items respawn as well via changing Sandbox settings.
*(it isn't uncommon for new small items to appear in places you have looted. This is temporary, as looting it again 1 or 2 times will finally exhaust that spot for good)

However, every several days (I think once a game week) the Portal worlds will reset, which means everything can be looted again. So all of those couches, and food, and computers in Flathill, yeah, totally restored.