Overthrow currently has minimal support for Game Master (GM). This page explains exactly what is and isn't supported, why, and what's coming.
TL;DR — GM-spawned ammoboxes are NOT SUPPORTED. Items you transfer out of them into an Overthrow ammobox or hold in your inventory can disappear on save/load/server restart. Until full GM support arrives, only items created by Overthrow itself (shops, gun dealers, loot, etc.) are safe.
If a server admin spawns an arsenal/equipment box through Game Master and players use it as storage, anything deposited into that box is never written to the save at all — it will be gone after every server restart, with no error or warning. Items that passed through a GM box and were moved into your inventory or an Overthrow ammobox are also affected and can vanish on the next restart.
This is not a design choice. It is a limitation of how the base game's GM-spawned arsenal boxes interact with persistence: the base game treats an arsenal's stock as virtual (regenerated, not saved), so its physical inventory is never serialized. Overthrow's persistence cannot currently override that behaviour. It's been investigated in depth — the items genuinely exist in no save file, so lost items are not recoverable.
/give-money admin command (v1.4.3+)To make legitimate seeding practical in the meantime, v1.4.3 adds an admin-only chat command that adds money to your account, so you can buy stock from gun dealers and fill real storage with it:
/give-money 50000
/givemoney (no hyphen) works too.The intended flow: /give-money → buy from a gun dealer or shop → store the items in an Overthrow ammobox or a vehicle. Everything in that chain is fully persisted.
Spawning props, units or vehicles through GM may appear to work, but it is currently outside what Overthrow supports — GM-placed content is not covered by Overthrow's persistence guarantees, and behaviour across restarts is untested. Use at your own risk on things you don't mind losing.
We will be adding a full suite of GM tools for Overthrow that server admins can use to orchestrate the campaign properly, including things like:
Until then, the supported path is: items created by Overthrow itself, plus /give-money for admin seeding.