In Paycheck (2003), Michael perfectly used all of the 20 items in the envelope.
Remember the English proverb
Practice makes perfect.
How many times does Michael travel through the time machine to gain a grip on the 20 items?
Micheal never time travelled in Paycheck. Infact, no one did same in this movie. Machine reverse engineered by made him able see the future but it cannot be used to travel in time.
Plot from Wikipedia
Jennings realizes he must have built this device based on Dekker's invention and, on realizing the horrors that will come, prepared the envelope, using the forecasts from the machine to allow his future self to return to Allcom and destroy the machine. Furthermore, as Rethrick discovers, Jennings rigged the device to malfunction, preventing Rethrick from anticipating Jennings' actions.