I know what would be in my ruck and duffel and the base game allows for almost nothing there. I know how much space they take up. Rations is really the only thing a character has that belongs there.
1e and 2e assume a build up for the Kalisz push. The introductory module is meant to decrement stuff. If that is to be played out in 4e, more stuff should be on hand.
1e and 2e require (though how often is it done?) that anything that can't be carried (on person or in vehicles) be left.
1e and 2e assume the group will "buy" a still and have it mobile. Losing the still is a major plot point for a campaign.
On the subject of empty casings (or is it complete cartridges?) used as currency, this is as silly as Dragonlance's steel pieces. These things have use outside of being a trade good, so there value as currency is limited. It's why humans use gold and silver for trade; before the computer age, they had no other practical use. Dollars and Zloty and Deutschmarks will retain value as long as people believe the next guy will honor their value, too. Coins will be the most likely surviving currencies, so it still clinks if you want jingly bags trading hands for stuff. But using useful things as currency rather than barter breaks verisimilitude for me.
On the difficulty of forage, how many others are or have done so recently in the same area? There may not be anything because "everyone else" has hunted it out. And any remaining animals are likely far more skittish around the apex predators than a few years ago. Fine tuning the difficulties is a valid discussion, but acknowledging you aren't the first in the hex needs to be done.