Send a sample to Blackstone. If they used real TGMO 0w-20, there is a lot of moly in it. Also, iron ppm up above 3 ppm would indicate old oil (probably 6 or 10 ppm is normal for old oil).
TBN below 4 indicates old oil. Lots of indicators there.
Or, just put a big sample in a clear jar, take it to the Toyota stealership, and ask them if they think this is 60-mile oil.
One thing we can all do in the future is put a small spot of paint on the side of the oil filter to see if they bothered to change the oil filter later. (sometimes they just wipe it off, making it look "new", so the paint spot on the side is nice to have)
TBN below 4 indicates old oil. Lots of indicators there.
Or, just put a big sample in a clear jar, take it to the Toyota stealership, and ask them if they think this is 60-mile oil.
One thing we can all do in the future is put a small spot of paint on the side of the oil filter to see if they bothered to change the oil filter later. (sometimes they just wipe it off, making it look "new", so the paint spot on the side is nice to have)