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No it cannot be store in inventory, Steam changed that many years ago. After purchase it must be added to your library.
The is not an Steam Gift... change your title is a regular CDKey what u are offering.
See this inventory:
https://steamcommunity.com/id/nolddor/inventory/#753_1
[H] Farthest Frontier
2 tf2 keys or OFFERS
https://store.steampowered.com/app/1044720/
Steam gift - will send to you
Your account must be in the following (currency and IP) to activate
Argentine Peso
Colombian Peso
Turkish Lira
Kazakhstani Tenge
Russian Ruble
Indian Rupee
Indonesian Rupiah
Region free to play