Instructions
Explore the levels comprehensively. Parcels and mailboxes are hidden and are sometimes in separate areas. Search the borders of each level and look for any objects masking hidden areas. Once you have found a red parcel, take it to the mailbox.
Pick up the red parcel and carry it to the mailbox. Clear the path from the red parcel to the mailbox. Characters can't attack or jump whilst carrying items so preparing the route avoids having to drop the parcel and start again. Post the red parcel in the mailbox and the new bonus will be available to purchase when you return to Bartlett College.
Play the game through on story mode. Characters can only interact with certain objects. Many level areas can only be accessed by characters that become available after story mode is completed. For example, statues can only be activated if you have unlocked the Thugee character.
Try using different characters. Access to mailboxes often relies on a specific character's ability. Indy can swing to other areas with his whip, Short Round can climb through small spaces and Willie Scott can break glass by screaming.
Interact with objects and characters in each level. Attack benches, fences, plants and everything else in the level. Metallic objects can only be destroyed by an explosion or rocket launcher and cannot be moved. Attack soldiers and guardsmen until they drop a grenade or rocket launcher. Free play mode allows you to select several different characters not available on the level in story mode. Play the levels in free play mode and select the Bazooka Trooper as one of the characters. Destroy all of the metallic objects to find any remaining mailboxes.