If the flowers Drew received today had been sent by someone who knows Drew well, that person would have known that Drew prefers violets to roses  Yet Drew received roses  On the other hand, if the flowers had been sent by someone who does not know Drew well, then that person would have sent a signed card with the flowers  Yet Drew received no card
Ttherefore, the florist must have made some sort of mistake: either Drew was supposed to receive violets, or a card, or these flowers were intended for someone else
Some people send flowers for a reason other than the desire to please.