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 experiences. 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 an experience
Roblox enables anyone to imagine and create immersive 3D experiences. You can buy perks and virtual items directly from these experience developers for Robux. Experience passes are sold on the experience's Store page, and all other virtual items are sold inside the experience. Pricing and quality are determined and maintained by the Developer and not by Roblox. Try contacting the experience's developer through private messages or their groups.