The Raiser's Edge displays only the first 255 active Packages listed on an Appeal record when selecting a Package to include as part of a Globally Add Records > Appeal.  

To display the desired Package, choose one of the following options:
OR

Please Note: This issue can also occur in other areas of the program including Globally Add Records. This issue will occur when trying to add 256th or higher package to some area or record of The Raiser's Edge. This requires you to click the "More" option, which will either populate in the field where the package should or the field will simply be just blank.