Encountered this shadow box with a christening gown for sale in an antique store in Iowa. There was no identifying information in the box. If you are creating a treasure of this type, attach something permanent to the item so that its identity is not lost.
Memories fade. Taped pieces of paper fall off.
Check out Ancestry’s St. Patrick’s DNA sale–maybe you can purchase your own kit or a test kit for that relative you’ve been wanting to ask.