These still work sometimes even after they
start saying "Sorry all rewards have been claimed"
Check your inventory and who knows, maybe
you'll be one of the lucky ones. Sometimes they will show up hours or up to a
day later. It's not always instant or even all at once. You might notice them
showing up 2-3 at a time over a day.
If you get told "Whoa, friend!
You've reached the collection limit for now" you can't collect any
more of this specific item or items in general. You'll need to try again later
when your counter has reset.