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 Those a pretty good numbers

You think the warning and caution stickers look like regular warning stickers that you see on electrical panels and people are not reading the text ? 
 That's totally possible. Someone on here said their warning stickers stay up longer than the other stickers so that definitely points to them blending in. 
 It's a dual-edge situation: they do disguise better to ensure longevity, but that also might be a crux because they blend in so well it appears to just be an ordinary advisory sign.

Perhaps a '₿' symbol could be added, or the QR label size increased? 

Additionally, if you're considering revamping an existing sticker, try replicating similar design aspects of the 'GOT INFLATION' one (repeat a successful action). 
 Didn’t even think of that.