I accidentally flushed a 1 1/2 inch pvc waste pipe plug down the toilet? Couldn't get I out with the auger (it's hard plastic and there is nothing to hook onto). Tried flushing some TP and had no problem?
Do you think it passed into waste line? If so will it make it out sewer line? I just had the toilet installed 2 days ago... so I am reluctant to pull it for no reason

Wait and see, that's about all you can do.

Testing it by flushing wads of TP down is the best way. If you don't get a back up then you should be OK. Since the opening in the bowl's a tad over 2" and the plug passed that you should be OK. Once in the main it will go out to then city sewer with no problems. If the TP didn't hang up, (and you did flush wads down a few times didn't you?) You should be just fine. Good luck, Tom

Flush toilet many times... Also, fill up tub in the same bathroom as the toilet and release water. Do it several times... It should flush it to the main line and eventually all the way to the City sewer.