From the 3rd of November 2014 until the 26th of January 2015, Boost customers recharging on the $40 UNLTD® offer either online or through their mobile handset using their credit card/debit card or paypal accounts are eligible for a bonus 500MB's of data!
Please keep in mind it may take up to 48 hours for the data to show up so if it's not their straight away there's no need to worry.
Also keep in mind that if you are recharging using a voucher (even if you redeem it online) you aren't eligible. You are required to recharge online or through your handset.
Enjoy the extra data!