Glad to see you are back in business.
Hopefully, the auger did the job. I'm a little suprised that he didn't just unbolt the toilet, pull it up and check the trap manually.
Terry has some great photos on here of things like the GI Joe he found wedged in the outflow hole at the bottom of the toilet on one job, so pulling the toilet is an easy (for him) and useful thing to do if the clog source isn't obvious.
If you end up needing a drain cleaner and if you strike out with or don't like the drain cleaning company your plumber recommends, our member MacPlumb often has good recommendations of drain cleaning pros in different areas, as he is a master plumber with expertise in that business. With regard to our own thoroughly-clogged driveway drain and rainwater drainage system, I reached out to him for a recommendation in New York after the first two "drain cleaning" companies told me that they couldn't open the drain and that I should have a contractor come in with a backhoe and repipe the system at a cost north of $5000. MacPlumb's guy used a water jet system to clear the pipes from the driveway drain some fifty feet to a cistern that nobody believed was connected to that drain (1900s house). He did this at a cost of about $450, and then, for good measure, cleaned the overflow pipe from that cistern to a french drain some distance away. I couldn't have been happier, particularly because I much prefer to maintain/repair the robust old system rather than replace it. Needless to say, I have recommended him to anyone that even hints that they need a service like this, and they have been universally-happy. Sorry I haven't seen anyone mentioned in Massachusetts, but I'm sure we can hook that up if it comes to it. Which hopefully it won't.