Private flight doing laps at 2500'...

I’ve been seeing this Cessna 206 on ADS-B for the last hour or so:

http://i.imgur.com/hQVvmAb.png

It’s a private flight and not trackable… Registration shows “N181SA - WELLS FARGO BANK NORTHWEST NA TRUSTEE (SALT LAKE CITY UT)” but that could just be the leinholder. Anyone seen something like that?

A guess from looking at the photo of it on here, probably some type of photo plane judging by the long exhaust pipes.

Noticed this one last week, at it again this weekend…
http://i.imgur.com/VLz9gZM.png?1

There was a post in discussions or a squawk (I forget which) regarding a fleet run by the FBI doing electronic surveillance. Vallejo and Rancho Cordova might be areas in which they have interest. A concern was whether they were sucking up cell phone info.