Try this
- Ask whether the object is welcome in shared space. Compare keeping the item, taking a permitted photo, or writing a short note.
- If you keep it, choose its home before buying or collecting more things from the same occasion.
A worked example
“Would we enjoy keeping this postcard on the shelf, or would a note about the trip be enough?”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
A meaningful outing does not require a physical object. Avoid making someone responsible for displaying or storing a souvenir they did not choose.