Took my car to a new Indy near my home.

Paid them to flush the brake fluid and refill but looking at my rims, it looks like they were not removed.
There should be hand marks on the rims which there weren't and I totally forgot to tell them where the tire lock key was located.
I thought the tires were suppose to be removed to flush out the brake fluid or is there a way to do that without removing the tires?

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2010 W212 E350 Sport
1996 W210 E320 (220K miles)