#### TL;DR
Previously, Ragfair offers involving ammo boxes weren't generated with cartridges inside of them. This copies a lot of the logic from `InventoryHelper.hydrateAmmoBoxWithAmmo()` to add ammo to offers when they are generated. Made to fix#312.
#### Testing
Purchased various ammo boxes from Flea:
Purchased ammo boxes are listed as full:
Unloading them produces correct ammunition:
Co-authored-by: Spoony <Spoony@example.com>
Reviewed-on: https://dev.sp-tarkov.com/SPT-AKI/Server/pulls/198
Co-authored-by: Spoony <spoony@noreply.dev.sp-tarkov.com>
Co-committed-by: Spoony <spoony@noreply.dev.sp-tarkov.com>
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