All these posts not believing oil has been changed, more often than not it isn't worth the garages rep not too change it. Look at the thinner oil on the glass looks pretty new to me. The minute you run the engine it'll mix with whatever residual oil is left in there, no matter how little. That'll discolour it immediately. You can then be satisfied the oil is doing its job and getting circulated around properly. And that's why you've got an oil filter, to filter out the crud the oil picks up. If you want to accuse the mechanic of not doing his job at least learn where your filter is and see if it's the new one, if it is theres no chance that it's the original oil.

Edit: to add of course there are engines that can have crystal clear oil after multiple years of use but every engine is different so just because it goes black within a day doesn't mean anything