Yeah, definitely seem a bit counter-intuitive to me to on the one hand - understandably - demand that riders don't just throw their bottles everywhere, but on the other hand consider it suspicious if riders return bottles to their team car. What are riders supposed to do with those bottles? Magically make them disappea into thin air?In stage 13 he was fined 200CHF for waste disposal outside the waste areas. After that stage the fine went up to 500CHF for a few stages. There were 29 littering fines, so this was strictly enforced by the jury. With that in mind handing bottles back isn't much of an indicator anymore, but hey, what does the police know.
As for the finding bloody bandages part; I'd say it's more suspicious to not find at least a few bloody bandages in relation to a bike team at a race, especially a GT. Because that would mean that the team in question would have found some way to enhance the riders, causing their skin to become super tough!