Free Blind Boxes come from playing: event rewards and minigames, Crew and event tracks, and some offers. Each one is an item that gives one pull of a specific Blind Box, and everything you get from it is Account Bound.
Where do free Blind Boxes come from?
It changes with each event, so check the event reward tracks for the Blind Box icon. Common sources are event and Crew reward tracks and event minigames. New players also get a welcome gift of starter Blind Boxes. How many an event gives, and which tiers give them, can change from one event to the next.
How do I open one?
When you earn it, tap Open Now, or Save to My Items to keep it for later. To open a saved one, find it in your inventory, tap it to see the possible rewards and odds, and open it. If you have several of the same one, you can choose how many to open.
Why are the items Account Bound?
Items from free Blind Boxes and free daily pulls are always Account Bound. You can wear them and recycle them, but you can't trade or sell them. See What does Account Bound mean?
Do they expire?
Yes. A Blind Box item expires when its Blind Box ends, and it's removed from your inventory. Your Inbox Activity warns you when one has 7 days or less left, so open it before then.
Is there a daily free Blind Box?
Not all the time. Highrise sometimes runs a daily free Blind Box offer in the shop: pick one of the featured Blind Boxes and open it once for free, and a timer shows when your next free pick is ready. These offers run for a limited time and may not appear on every account. If you don't see one in your shop, there isn't one available to you right now, and Support can't add it.
Do free pulls count toward guarantees and collection rewards?
Yes. A free pull is a normal pull of that Blind Box, so it counts toward its guarantees and collection progress just like a paid one. See What are the odds in Grabs and Blind Boxes?
I didn't get a Blind Box I earned
Check your inventory and your Inbox Gifts first. For event and Crew track rewards, see Missing event rewards. If a Blind Box you earned is missing, contact Support with the event or reward name, the date, and a screenshot of the reward track.