matter != mass.
energy stored (and accounted for as mass) goes to heat, as soon as your ebook reader cools down, the added "mass" is dissipated as entropy.
You're saying that because you can calculate the wavelength of a mac truck barreling down the highway, that it should behave as a wave when meeting an oncoming "wave" that is barreling down the highway. Which it doesn't, thus disproving a photon's behavior as a particle on the quantum scale.
Thus successful "troll" (attempt at humor) is successful and this reply is WOOOSHed...