Whether you're playing as Leon or Claire, the solutions remain the same and can be accessed without grabbing the memo that hints at their solution. The only exception to this are the items you grab by developing film rolls--though, there is a minor exception even to that. Regardless, below you can find details on all the optional items locked behind safes, lockers, or hidden in the environment.
LOCKERS ARE USED AT RENTER’S OWN RISK. THE OPERATOR (INCLUDING EMPLOYEES, AGENTS, AND/OR CONTRACTORS OF THE OPERATOR, THE EVENT AND THE VENUE) DISCLAIMS ANY AND ALL LIABILITY FOR ANY ITEMS STORED WITHIN THE LOCKERS OR THE LOCKER FACILITY, INCLUDING LOSSES RESULTING FROM LOCK FAILURE, RIOTS, VANDALISM, WEATHER, LOCKER ACCESSED BY OTHERS, COMBINATION ACCESSED BY OTHERS, THEFT, OR FAILURE TO COLLECT THE ARTICLES AFTER USE.