Yes. You can unmark an item as purchased so it becomes available again.
For registrants:
To restore a gift, go to Things to Do and select View Thank You Note Tracker. Choose the item, click the three dots on the right-hand side, and select the option to unmark the gift as purchased.
For guests:
If you would like to restore a gift that was marked as purchased, please contact our Customer Service team via live chat or by phone at (201) 886-1000 for assistance.