Jimmy,
There is no "free bonus bytes token".
There are THREE potential sources from which you can draw data with the main difference being that of time period.
#1: Anytime Bytes (used between the hours of 8am to 2am local)
#2: Bonus Bytes (used between the hours of 2am to 8am local)
#3: Token Bytes
Token bytes are blocks of data that you may purchase at extra cost or are received as "freebies" from support to allow troubleshooting or to resolve other issues.
Gen4, as Liz stated, no longer routinely passed out as they were in the daily refill legacy plans.
Here is a graphic from the Gen4 HT1100 SCC that depicts these three "data buckets"
(click on picture for larger image)