If "bitcoin is a virtual currency" as they say, why don't some people consider a pendrive as a "physical-virtual currency"?

A genuine question, if "bitcoin is a virtual currency" as they say, why don't some people consider a "pendrive" (a physical device that stores public-private keys to manage coins on a blockchain) as a "physical-virtual currency"?

For example, suppose Bob gives Alice a pendrive that contains 1 bitcoin. Alice exchanges his favorite programming book called: "Javascript" for 1 bitcoin contained on the pendrive.

how?

Alice(book) -> Bob (pendrive)
Bob(pendrive) -> Alice (book)

would this be considered a valid transaction (pendrive -> book) even though it is not on the blockchain? In this hypothetical scenario, was there a valid transaction even though nothing was done directly on the blockchain?



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