Ways to find license usage by Forwarder without using license_usage.log?

I'm putting together some simple dashboards to give our internal users a view into what their servers are sending into Splunk, and how much of it.

I've had pretty good luck using the data that comes out of this search:

index=_internal type=Usage

However, I have noticed some results that look like:

05-09-2013 14:36:23.327 -0400 INFO  LicenseUsage - type=Usage s="" st=webseal_server_log h="" o="" i="ZZZZZZZZ-AAAA-XXXX-XXXX-YYYYYYYYYYYY" pool="Company Master Pool" b=38693 poolsz=41875931136

While writing up this question, I came across the explanation of "squash_threshold" and what it does.

So... aside from raising the value to a very large amount, is there another source of figuring out how many bytes a specific forwarder sent in?