I bought an item from the Catalog
Your Inventory has many categories. Be sure to check all the categories such as hats, hair, animations, faces, and packages.
Instructions for viewing your Inventory
Other players can create Packages or Decals that look like official Roblox items, for use in decorating games. To tell the difference before buying, you can see what its item type is underneath its title on the item details page.
I bought something from a game
Roblox enables anyone to imagine and create immersive 3D games. You can buy perks and virtual items directly from these game developers for Robux. Game passes are sold on the game's Store page, and all other virtual items are sold inside the game. Pricing and quality are determined and maintained by the Developer and not by Roblox. Try contacting the game's developer through private messages or their groups.