Seems to be a generic barcode for their What's Your Name Game where you can win a free boost each day from 19 September to 7 October. Limit of 1 per customer per day.
Also there are $5 Boost Juices at Blacktown until Thursday.
Boost Juice Blacktown has a fresh new look!
Show or mention this offer to get a $5 Boost
I guess you just have to mention it.
I hope the free boost voucher is generic too