What were the funerary treasures found in Tutkamun's coffin? How did historians come to the conclusion that king tut's death in the month of A pril ?

For the journey to the great beyond, King Tut was lavished with glittering goods, precious collars, inlaid necklaces and bracelets, amulets, a ceremonial apron, sandals, sheaths for his fingers and toes, the iconic inner coffin and mask, all made of pure gold. Carter's men had removed the mummy's head and severed nearly every joint to separate the adornments from the body. Once, they had finished, they reassembled the remains on a layer of sand in a wooden box with padding that concealed the damage that had been wrought on Tut.
The flowers mentioned in the text are those which bloom in the months of March and April. If such flowers were used to make the garlands then it is possible that the death might have occurred in those months as one would tend to use seasonal flowers.