"...is there any way to know if he mixed them already with H2O or if they are still full concentrate?..."
Take a small amount (1/4 cup?) of one of the coolants and mix an equal amount of distilled water with it. Stir. Test the mixture for protection level. If it shows that it will protect to way below 0 then the coolant likely WASN'T thinned in the first place. If shows protection to barely below freezing then it likely WAS already thinned.
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)
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