Anywhere reprinting would hurt.
The more copies are already out in the world, the more a code you can repoint is worth. What that looks like in ten places it gets printed.
Restaurant menus
Change the menu behind the code when prices or seasons change.
Event signage
Point at the schedule during the event, the recordings after it.
Product packaging
Change what the pack opens without waiting out warehouse stock.
Real estate riders
Repoint the sign when the property sells, instead of binning it.
Business cards
Keep the box you already printed accurate when details change.
Equipment labels
Relabel nothing when manuals or service contacts change.
Trade show booths
Reuse the same booth panels with a different offer each show.
Museum placards
Rotate exhibits and revise interpretation without new placards.
Parking notices
Change payment providers and rates without replacing signage.
Vehicle wraps
Change the campaign without taking the fleet off the road.