If you are creating a package and you find that your item is not listed as an option to add to that package, it may be that the item has a bid placed already.  

To check if there is a bid on the item, go to Components > Auction > Online/Mobile tab and search the item.  

If there is a bid placed on the item, you will need to cancel the bid in order to add it to the package.  

NOTE:  When you cancel a bid, the user is notified that their bid was cancelled.