Well, I tried to take the easy way to deal with my Nexus 6P and use the trade-in service when I bought my Pixel 2 XL. The POS company Google is using is giving me $15.20 instead of $151 because: 1) It wasn't factory reset (B.S., it was.) and 2) it was received more than 30 days after I initiated the trade-in (which is not even the current policy, it's now 30 days after you receive the new phone, mine was sent in well within this timeframe.)
I contacted Google customer support, they escalated the issue and gave me a case number and promised me a response within 48-72 hours. If I don't receive what was quoted for my phone, I'll cancel Google Protect to make up the difference. Also, I will never do a trade-in through Google again. Lesson learned, I guess.