Square Enix previously indicated these items could be redeemed more than once to be used in future saves, although shortly after Deus Ex’s release, the publisher renamed the pre-order bonus to the “Augmented Covert Agent Consumables Pack.”
The pre-order bonus for the PC version offered the Covert Agent Pack, which included access to some weapons, outfits, and consumable upgrades.
Hopefully, Square Enix changes it mind on how the Covert Agent Pack works, but at this point, we highly doubt it.
To change the way these pre-order bonus items work after releasing the game appears to be a bit underhanded.